Context, not only content, is king, my friend, in language.
Correct, so let's put his speech/statement in context.
Trump had spent the prior two months telling his supporters that democrats had stolen the election. Not stolen like a crazy last minute play at the end of the game, stolen as is a deliberate, coordinated and brazen attempt to defy the most basic rules and principals of Democratic governance in order to attain power over the will of the people standing in that very crowd.
Trump then calls on them all to come to DC to "stop" this from succeeding. Stop how exactly?
In his message he tells them the protests "will be wild". Have you ever heard of a peaceful protest described as wild? Of course not, that's an oxymoron.
Then the rally commences and Trump is preceded by speakers saying things like "let's have trial by combat", and "Today is the day American patriots start taking down names and kicking ass!".
Then... Trump speaks.
In his speech he delivers 11k words over 70 minutes. One line... One... Ostensibly urges calm. The rest of his speech is remarkably inflammatory, telling the crowd they have to show strength, they have to fight, and if they fail they won't have a country anymore. This isn't the language and posture of someone who wants peace.
So now, with all of the context, we can evaluate Trump's "peacefully and patriotically" line. One of these things is not like the others.
Again, how do you make your voices heard to people who are literally in the process of stealing your voice? In any society, power is only achieved in one of two ways; agreement or force. Agreement is what democracy is founded on. If that is broken, force is the only thing remaining. So if the election is literally being stolen as Trump explicitly alleged for two months prior, revolution is the only option left. You can't accomplish that by yelling really loud.
The idea that Trump wanted them to be peaceful contradicts everything Trump demonstrated to the crowd that day and in the months prior. They were riled up to be violent before that speech even began. So you're absolutely right - context is king. But you have to apply the entire context, not just the cherry picked version that appeases your predisposition.
And if there was any doubt as to what Trump wanted, that was no longer reasonably debatable after Trump's 187 minutes of watching the riots on TV taking no official action to stop it.