To be fair, if this was only a violent protest likely nothing would have happened. The first guy shot was a suicidal mental patient who had just been released earlier that day. I'm not being hyperbolic. He just got out and had all of his possessions in a clear plastic bag the institution had given to him. He had thrown that bag at Rittenhouse seconds before lunging at him.
You'd expect looting, burning, brick throwing, and graffiti because that is how you convince people that Black lives matter but I don't think much of anyone had suicidal mental patient on their riot bingo card. As for the rest of the heroes after the mental patient committed suicide by provocation, all they had to do was let Rittenhouse run down the street to surrender to police.