I don't know how to feel about that.
I think there definitely are forms of protest that objectively just hurt any movement. A few people looting stores, setting random stuff on fire and most forms of violence will make the whole crowd appear violent and scare off the general public. If you protest against Trump and then steal stuff from a local store, the vast majority will neither see that as related to Trump nor as an acceptable form of protest. Less people will protest and, more importantly, Trump can use the videos etc. to justify his behavior.