Look, stick...there is no right to violent protest. If these spoiled little children had not trashed other cities while throwing their tantrums, there wouldn't be any problem with the police. The problem is, peaceful protest doesn't get anywhere near the media attention that violent protest does. And that's the goal of these anarchist p**ks. So don't blame the police for knocking a few heads.
Punks moving pallets and parking logs to create barricades in the middle of the streets.