I am not in favor of rioting/looting but historically, it has been proven effective in some cases to get changes made.
There were 150 riots in the USA between 1965 and 1968, when LBJ was gathering the votes for civil rights.
The Selma march involved police using attack dogs and water cannons are peaceful marchers. It's damned amazing that (perfectly justifiable) violence against police didn't break out. The tools police use now would (and do) make it far more damaging.
Nelson Mandela was literally a marxist terrorist, yet is often held up as some kind of ideal of non violent protest.