If Rittenhouse shot a black guy, even if it was in self defense, he would've been absolutely fucked. I'll be shocked if he gets 25 to life since I don't think Antifa's going to riot over a bunch of straight-looking white guys, even if one of them is a suicidal pedophile.
While it was dumb for him to drive 30 minutes to Kenosha and hold a gun without knowing for sure if he had the legal right to do so, he isn't a threat to anyone who isn't charging at him (i.e. a great majority of the population). Possession of a dangerous weapon is the only charge that should really be applied, and not as an adult either. He's not a hero, but he's no villain.