Actually, have you seen Daniel Shaver's killing? No riot. Outcome: that policeman collects a pension and rests easy at home. So it is established your technique doesn't work.
When the good things don't work, eventually you get the bad things. That's not even through people changing. It's through the people changing. I remember reading in the WSJ or the NYT about one particular time in the Egyptian Muslim Brotherhood's recent history when there was a bit of tension between their young firebrand wing and their older mellower leaders (though both were still religious). At the time, the older leader was in hiding (on account of the military looking for him) and there was a bit of violence so he came out to appeal for peace and was promptly arrested. This had the predictable effect of weakening the mellow side and turning the organization more radical (or so the article predicted).
So you don't have to turn people into rioters, you can just destroy the credibility of everyone calling for peaceful resolutions by dismissing them out of hand repeatedly. Eventually no one will listen to them. And then the only people with power in those groups are the firebrands. A complete own-goal if you're looking for peace.
Especially worth looking at Rep. Joyce Beatty who is a 70 year old black woman who got peppersprayed with the protesters. An elected lawmaker was attacked by the cops. Think about it.
Violent Protest: Guy got arrested
It's already achieved more, so I think we're good here. But the truth is that this is out of control of individuals. The system of groups of people responds to the stimulus in predictable ways. This was unavoidable.
Everything you casually take for granted people had to die for.
not a happy cycle