Earlier quoted context omitted.
I cannot condone violence nor encourage it, but you have to admit that the first few protests and property damage drastically influenced the quick arrest of an officer that may not have been arrested or even fired if it didn't happen. The non-violent protests of Colin Kaepernick were mocked and used to rally the other side and just weren't effective. The problem here is not the violence, but a policing system that is…
Civil disobedience != violence. Illegal action is sometimes justified. Violence never is.
You cannot tell a group of people that violence must be beneath them when they're facing a system that employs violence against them with impunity and often bends over backwards to justify it, in a culture which holds violence as one of the foundations of liberty itself. That would be suicidal.
Violence should be a last resort, but it can't ever be off the table, not in the US.