Seems like the stupidity was all around that night.
I don't have to know what others are thinking when they pickup an AR-15, attend a riot where everybody else is against you, start antagonizing the participants by cleaning up the mess they made of buildings, putting out the fires they just set, and trying to protect some car lot. It's not like he was with another group of people on his side equal to the amount of rioters. It was him and his buddy.
Yes, kids will make mistakes like going to where they're not supposed to be, but not armed with an AR. I never did that as a kid, did you?
As for the rioters they should be arrested and pay whatever price for the damage they did, but so should this kid. I don't think he should be in prison for the rest of his life, but I think the jury should consider manslaughter charges. And it's not my opinion, it's my training. Wisconsin law does not give self-defense with a firearm unlimited protection. When you intentionally put yourself in a position you will likely use that firearm, it makes self-defense null and void. The law specifically states you are covered under self-defense unless you took every precaution to avoid using the firearm you are carrying. Rittenhouse did the exact opposite. The prosecution not telling the jury about their laws makes it clear to me he is throwing this case on purpose.