It would be easy for people to second guess someone's actions in retrospect, with the advantage of hindsight. It would be obviously ideal in a situation if a person were to have both the time and ability to thoroughly assess all factors, consider all options, and evaluate all potential paths of consequence. Unfortunately in real life, those opportunities may not be able to afford themselves, and people have to, on occasion make decisions based on the best possible information, in line with their values and beliefs. When my kid was young and in kindergarten (he's in university now), and I was picking him up one day, a bunch of us parents were waiting outside the kindergarten pen for the kids to be released. Well the first kid came out in a snowsuit, looked like the michelin man. The second kid came out - and you can just sense he was trouble as he was circling the first kid. He knocked over the first kid, whose glasses came flying off, and started to stomp on his head. The other parents - all mothers, all just told him to "stop it". No one went into the gated / penned area. Kid did not relent.
I hopped over the fence and grabbed the attacking kid and held him at bay until the teacher and other kids came out. I explained what happened to the teacher, not before several woke parents (yes, even in 2007 they existed) were like "you are not allowed to touch that kid" and "you are going to get CAS on you". It was so pathetic. At that point, fear started gripping me, but I wouldn't have changed the action, irrespective of the consequences. Sometimes you just do the right thing, especially when no one else is willing to help. That's why people who choose to take their own security in their hands and have a home defence gun - they get chastized by the mainstream media and even by some in the gun community who think, "oh, just call and wait for the cops". In an ideal world, maybe that's the right response, when you have time to spare, and the home invader or whoever is not close to advancing on you. As we all know, any kind of self defence shooting in Canada will likely result, irrespective of justification or not, in possible arrest and no doubt having to go through the legal process to clear your name, at great personal financial expense. One may not consider all those options when you have to make a split second decision on defending yourself.
It is easy to second guess Rittenhouse's actions based on youth, etc. But I personally would rather have more of people like him who see injustices and can't stand by and watch, in the face of insufficient police response.