Everywhere in the world when you get massive social unrest like we're seeing you get violence. It's always the way some people react. It just is.
You seem to be focusing just on the bad stuff. Most of the protesters ARE peaceful. If I'm marching and chanting, holding a banner, and ten blocks away some kids start breaking store windows...what do you expect me to do?
Hate to tell you this, but back in the 1960s in many cities, peaceful protests changed very little. A big city mayor from that era admitted, I think it was in Rochester NY, peaceful protests about discriminatory policing and substandard housing (because the city failed to enforce building codes in low-income neighborhoods) were easy to ignore. A week of rioting, looting and arson forced officials to realize they had to make real changes. They still didn't really want to but they realized they
had to.
As Barretta used to say, "And that's the name of that tune."