I'll do my best to give you a just response. Personally, I would define the Church's Social Doctrine as neither conservative nor liberal (in the U.S. understanding of the terms). I would also like to say that it is understandable how one may deem the Church as either liberal or conservative, this attack is common from both sides, but under proper analysis neither is the case.
Populorum Progressio (23) The Use of Private Property
"He who has the goods of this world and sees his brother in need and closes his heart to him, how does the love of God abide in him?" (21) Everyone knows that the Fathers of the Church laid down the duty of the rich toward the poor in no uncertain terms. As St. Ambrose put it: "You are not making a gift of what is yours to the poor man, but you are giving him back what is his. You have been appropriating things that are meant to be for the common use of everyone. The earth belongs to everyone, not to the rich." (22) These words indicate that the right to private property is not absolute and unconditional.
No one may appropriate surplus goods solely for his own private use when others lack the bare necessities of life. In short, "as the Fathers of the Church and other eminent theologians tell us, the right of private property may never be exercised to the detriment of the common good." When "private gain and basic community needs conflict with one another," it is for the public authorities "to seek a solution to these questions, with the active involvement of individual citizens and social groups." (23)
I do not see how this aligns with modern liberalism. The call to charity isn't something liberal nor is the acknowledgement that the right to private property isn't absolute. I do not know of any libertarian/conservative systems that teach absolute private property (not even anarcho-capitalism teaches this).
Populorum Progressio (22) Issues and Principles
22. In the very first pages of Scripture we read these words: "Fill the earth and subdue it."(19) This teaches us that the whole of creation is for man, that he has been charged to give it meaning by his intelligent activity, to complete and perfect it by his own efforts and to his own advantage.
Now if the earth truly was created to provide man with the necessities of life and the tools for his own progress, it follows that every man has the right to glean what he needs from the earth. The recent Council reiterated this truth: "God intended the earth and everything in it for the use of all human beings and peoples. Thus, under the leadership of justice and in the company of charity, created goods should flow fairly to all." (20)
All other rights, whatever they may be, including the rights of property and free trade, are to be subordinated to this principle. They should in no way hinder it; in fact, they should actively facilitate its implementation. Redirecting these rights back to their original purpose must be regarded as an important and urgent social duty.
Again, I do not see the liberalism here. Basic Christian stance that the earth was given to man including all its resources. Also, we see another call to charity.
Populorum Progressio (84) To Government Authorities
84. Government leaders, your task is to draw your communities into closer ties of solidarity with all men, and to convince them that they must accept the necessary taxes on their luxuries and their wasteful expenditures in order to promote the development of nations and the preservation of peace. Delegates to international organizations, it is largely your task to see to it that senseless arms races and dangerous power plays give way to mutual collaboration between nations, a collaboration that is friendly, peace oriented, and divested of self-interest, a collaboration that contributes greatly to the common development of mankind and allows the individual to find fulfillment.
Is it the taxes that are supposed to be the liberal part here? The call for peace and not war?
Populorum Progressio (33) Programs and Planning
33. Individual initiative alone and the interplay of competition will not ensure satisfactory development. We cannot proceed to increase the wealth and power of the rich while we entrench the needy in their poverty and add to the woes of the oppressed. Organized programs are necessary for "directing, stimulating, coordinating, supplying and integrating" (35) the work of individuals and intermediary organizations.
It is for the public authorities to establish and lay down the desired goals, the plans to be followed, and the methods to be used in fulfilling them; and it is also their task to stimulate the efforts of those involved in this common activity. But they must also see to it that private initiative and intermediary organizations are involved in this work. In this way they will avoid total collectivization and the dangers of a planned economy which might threaten human liberty and obstruct the exercise of man's basic human rights.
Here maybe I can see somewhat of what you may mean but even then, it's flimsy. To not want the poor to get poorer while the rich get richer isn't strictly a liberal tenet. I do not know of conservatives that would wish the poor to get poorer. Organized programs conservatives participate in as well. The second part states that the government shouldn't interfere with private initiative and intermediary organizations. The actual Compendium of the Social Doctrine of the Church (CSDC) goes further in depth on the role of government in society. The promotion of the family and building around it is a big part.
Laborem Exercens (14) Work and Ownership
This was actually referenced already in Populorum Progressio 23. Here however he specifically states that the right to private property is understood differently in the Christian context as opposed to the Marxist and Capitalist understandings.
Rerum Novarum (45)
45. Let the working man and the employer make free agreements, and in particular let them agree freely as to the wages; nevertheless, there underlies a dictate of natural justice more imperious and ancient than any bargain between man and man, namely, that wages ought not to be insufficient to support a frugal and well-behaved wage-earner. If through necessity or fear of a worse evil the workman accept harder conditions because an employer or contractor will afford him no better, he is made the victim of force and injustice. In these and similar questions, however - such as, for example, the hours of labor in different trades, the sanitary precautions to be observed in factories and workshops, etc. - in order to supersede undue interference on the part of the State, especially as circumstances, times, and localities differ so widely, it is advisable that recourse be had to societies or boards such as We shall mention presently, or to some other mode of safeguarding the interests of the wage-earners; the State being appealed to, should circumstances require, for its sanction and protection.
Is it the interference of the State that's liberal? It seems to be that the State is called upon to protect its populace from injustice which is a part of its function.
Populorium Progressio (59) Justice at Every Level
59. The teaching set forth by Our predecessor Leo XIII in Rerum Novarum is still valid today: when two parties are in very unequal positions, their mutual consent alone does not guarantee a fair contract; the rule of free consent remains subservient to the demands of the natural law. (57) In Rerum Novarum this principle was set down with regard to a just wage for the individual worker; but it should be applied with equal force to contracts made between nations: trade relations can no longer be based solely on the principle of free, unchecked competition, for it very often creates an economic dictatorship. Free trade can be called just only when it conforms to the demands of social justice.
The recognition of what constitutes a just contract is liberal?
Rerum Novarum (44)
This is a basic concept of life. Anything I could has been said already in previous citations.
Octogesima Adveniens (23) Advantages and Limitations of Juridical Recognition
23. Through the statement of the rights of man and the seeking for international agreements for the application of these rights, progress has been made towards inscribing these two aspirations in deeds and structures (16). Nevertheless various forms of discrimination continually reappear - ethnic cultural, religious, political and so on. In fact, human rights are still too often disregarded, if not scoffed at, or else they receive only formal recognition. In many cases legislation does not keep up with real situations. Legislation is necessary, but it is not sufficient for setting up true relationships of justice and equity. In teaching us charity, the Gospel instructs us in the preferential respect due to the poor and the special situation they have in society: the more fortunate should renounce some of their rights so as to place their goods more generously at the service of others. If, beyond legal rules, there is really no deeper feeling of respect for and service to others, then even equality before the law can serve as an alibi for flagrant discrimination, continued exploitation and actual contempt. Without a renewed education in solidarity, an overemphasis of equality can give rise to an individualism in which each one claims his own rights without wishing to be answerable for the common good.
In this field, everyone sees the highly important contribution of the Christian spirit, which moreover answers man's yearning to be loved. "Love for man, the prime value of the earthly order" ensures the conditions for peace, both social peace and international peace, by affirming our universal brotherhood (17).
Charity isn't a strictly liberal belief. If it's the idea that individualism is looked down upon the Church's understanding of individualism is different than common political economics.
Populorum Progressio (58) Free Trade Concept Inadequate
58. It is evident that the principle of free trade, by itself, is no longer adequate for regulating international agreements. It certainly can work when both parties are about equal economically; in such cases it stimulates progress and rewards effort. That is why industrially developed nations see an element of justice in this principle.
But the case is quite different when the nations involved are far from equal. Market prices that are freely agreed upon can turn out to be most unfair. It must be avowed openly that, in this case, the fundamental tenet of liberalism (as it is called), as the norm for market dealings, is open to serious question.
This ties into the contracts previously mentioned.
Sollicitudo Rei Socialis (32)
32. The obligation to commit oneself to the development of peoples is not just an individual duty, and still less an individualistic one, as if it were possible to achieve this development through the isolated efforts of each individual. It is an imperative which obliges each and every man and woman, as well as societies and nations. In particular, it obliges the Catholic Church and the other Churches and Ecclesial Communities, with which we are completely willing to collaborate in this field. In this sense, just as we Catholics invite our Christian brethren to share in our initiatives, so too we declare that we are ready to collaborate in theirs, and we welcome the invitations presented to us. In this pursuit of integral human development we can also do much with the members of other religions, as in fact is being done in various places.
Collaboration in the development of the whole person and of every human being is in fact a duty of all towards all, and must be shared by the four parts of the world: East and West, North and South; or, as we say today, by the different "worlds." If, on the contrary, people try to achieve it in only one part, or in only one world, they do so at the expense of the others; and, precisely because the others are ignored, their own development becomes exaggerated and misdirected.
Peoples or nations too have a right to their own full development, which while including - as already said - the economic and social aspects, should also include individual cultural identity and openness to the transcendent. Not even the need for development can be used as an excuse for imposing on others one's own way of life or own religious belief.
Sollicitudo Rei Socialis (39)
39. The exercise of solidarity within each society is valid when its members recognize one another as persons. Those who are more influential, because they have a greater share of goods and common services, should feel responsible for the weaker and be ready to share with them all they possess. Those who are weaker, for their part, in the same spirit of solidarity, should not adopt a purely passive attitude or one that is destructive of the social fabric, but, while claiming their legitimate rights, should do what they can for the good of all. The intermediate groups, in their turn, should not selfishly insist on their particular interests, but respect the interests of others.
Positive signs in the contemporary world are the growing awareness of the solidarity of the poor among themselves, their efforts to support one another, and their public demonstrations on the social scene which, without recourse to violence, present their own needs and rights in the face of the inefficiency or corruption of the public authorities. By virtue of her own evangelical duty the Church feels called to take her stand beside the poor, to discern the justice of their requests, and to help satisfy them, without losing sight of the good of groups in the context of the common good.
The same criterion is applied by analogy in international relationships. Interdependence must be transformed into solidarity, based upon the principle that the goods of creation are meant for all. That which human industry produces through the processing of raw materials, with the contribution of work, must serve equally for the good of all.
Surmounting every type of imperialism and determination to preserve their own hegemony, the stronger and richer nations must have a sense of moral responsibility for the other nations, so that a real international system may be established which will rest on the foundation of the equality of all peoples and on the necessary respect for their legitimate differences. The economically weaker countries, or those still at subsistence level, must be enabled, with the assistance of other peoples and of the international community, to make a contribution of their own to the common good with their treasures of humanity and culture, which otherwise would be lost for ever.
Solidarity helps us to see the "other"-whether a person, people or nation-not just as some kind of instrument, with a work capacity and physical strength to be exploited at low cost and then discarded when no longer useful, but as our "neighbor," a "helper" (cf. Gen 2:18-20), to be made a sharer, on a par with ourselves, in the banquet of life to which all are equally invited by God. Hence the importance of reawakening the religious awareness of individuals and peoples. Thus the exploitation, oppression and annihilation of others are excluded. These facts, in the present division of the world into opposing blocs, combine to produce the danger of war and an excessive preoccupation with personal security, often to the detriment of the autonomy, freedom of decision, and even the territorial integrity of the weaker nations situated within the so-called "areas of influence" or "safety belts."
The "structures of sin" and the sins which they produce are likewise radically opposed to peace and development, for development, in the familiar expression Pope Paul's Encyclical, is "the new name for peace."68
In this way, the solidarity which we propose is the path to peace and at the same time to development. For world peace is inconceivable unless the world's leaders come to recognize that interdependence in itself demands the abandonment of the politics of blocs, the sacrifice of all forms of economic, military or political imperialism, and the transformation of mutual distrust into collaboration. This is precisely the act proper to solidarity among individuals and nations.
The motto of the pontificate of my esteemed predecessor Pius XII was Opus iustitiae pax, peace as the fruit of justice. Today one could say, with the same exactness and the same power of biblical inspiration (cf. Is 32:17; Jas 3:18): Opus solidaritatis pax, peace as the fruit of solidarity.
The goal of peace, so desired by everyone, will certainly be achieved through the putting into effect of social and international justice, but also through the practice of the virtues which favor togetherness, and which teach us to live in unity, so as to build in unity, by giving and receiving, a new society and a better world.
Most of these I don't really see what makes them "liberal". If you can please explain. I think there were two where maybe I can see where you might go but even then, it wouldn't be liberal. But I would like to hear what you would have to say. Personally, I do not believe I Catholic should adhere to the titles of conservative or liberal (in the American sense) as the Church is so different than both ideologies.
