"But is there evidence that he just wanted to cause trouble, or wanted to shoot at people, or even that he was against non-arsonist protesters?"

Oh Jesus H. Freaking Christ.

Is there any evidence that leaving gasoline-soaked rags near an open flame will cause a fire?

Circumstantial alone: he took the trouble to procure a gun, not just a gun but a weapon of massacre, and entered a zone of violent chaos. You can bat your eyes all you like but that is not innocence.

He was the only person seen administering first aid? Great, He was also the only person who shot and killed anyone.

But: before he went to Kenosha he told a lot of his friends that he wanted to shoot people there. Many witnesses to this. Thus endeth your argument.