I can understand violence for the sake of social change. I dont agree with it but I understand it. Looting a target is not violence for the sake of social change. It is a handful of people taking advantage of a horrible situation for personal gain.
I am sure that 99 percent of the protesters are upset about what happened and are wanting change. But there is that 1 percent who show up because they are looking for trouble.
Its like those alt right idiots who show up armed at those protests to reopen states. I doubt some of them care about the shut down. They just want to wave their guns and hope for a confrontation with police.