I would like to thank Double_R for accepting this debate. In this debate, I will be defending the proposition that objective moral facts and duties exist. By objective, I mean that these facts are mind-independent.
Moral realism is the position that moral statements like “It is wrong to torture babies for fun” and “Rape is wrong” are statements about reality and can be true or false like “2+2=4”. Conversely, moral anti-realism states that these statements collapse back into a statement like “I prefer red ot blue.” Under moral anti-realism these statements are neither true nor false.
In assessing whether or not moral realism or anti-realism is true I want to focus on two major points: 1) Epistemic virtue and normativity; and 2) Moral progress. As such, I contend that if my opponent denies that there are mind-independent moral facts, then he risks running into absurdities. The fact that we can make claims about what it means to reason and what it means to progress as a society only makes sense if moral realism is true.
Epistemic virtue and normativity
For rational discourse to be even remotely possible it requires a minimum set of standards before the debate can even continue. For example, we should all agree on these principles: 1) We ought not believe falsehoods; 2) we ought not misrepresent the opposing side; 3) we ought to argue in good faith; and 4) we ought not use logical fallacies. Consider the following dialogue:
David: What do you think of my argument for evolution?
Double_R: I think it's a sound argument -- your conclusion was well-argued, and I see no problems with it.
David: So does that mean you'll reject young-earth creationism now and accept the scientific facts of evolution?
Double_R: No
David: Why not?
Double_R: Because I have no duty to embrace the truth. I reject reality and replace it with my own
This dialogue is rightfully absurd. If there are mind-independent epistemic facts and duties then why are there no moral facts and duties? Accepting one while rejecting the other, or even worse rejecting both, makes dialogue and truth finding impossible. As Michael Jones puts it:
P1. If moral facts do not exist, then epistemic facts do not exist.
P2: Epistemic facts do exist
C1: Moral facts do exist.
P3: If moral facts do exist, then moral realism is true.
C2: Moral realism is true
Moral Progress
The final piece of evidence I would like to bring up is the evidence from moral progress. If there are no mind-independent moral facts and duties, then moral progress becomes meaningless.
Almost everyone can agree that slavery is wrong and that the abolition of slavery was an improvement on society. But why should we believe this is the case? If morality were merely subjective or based on culture, then who is to say that we actually made progress as a society? Indeed, an anti-realist could easily argue that the abolition of slavery was immoral because it stole people’s property! If morality were not mind-independent, then who is to judge and who is to say whose right?
Also consider the holocaust, one of the worst crimes against humanity ever committed. If morality were not mind-independent then, how could one objectively condemn the nazis for their actions? The nazis argued that the Jews presented a danger to Germany and they needed more “living space.” Under anti-realism how can we determine which position is correct? This is one of the questions I want to force my opponent to answer.
1. Michael Jones, "Moral Realism Defended." https://youtu.be/zjkgD4w9w1k?si=fgWg7NfYThtSr3PL&t=42