The psychologist Stephen Pinker, has pointed out that violence itself is a tool of last resort in the human toolkit. The violence of rioters is mostly spontaneous and fueled by anger, flamethrowers and sledge hammers directed at objects belonging to a system they feel has not responded to their needs or concerns. The fact that violence is not the best tool for the job is irrelevant by this point.
Cooler, smarter and more sympathetic heads should actually focus more on what triggered the riots and determine the changes that are necessary to remediate legitimate grievances and hopefully prevent the recurrence of such failures. The reading list offers an excellent beginning for that. Discussing the efficacy and justification for rioting probably doesn't.