There is a double standard. Nevertheless, pointing out that the double standard exists does not negate the need to clamp down on rioters whenever and wherever they occur. I couldn't care less if it's drunken college kids, excited sports fans, Occupy Wallstreet folks, or people pissed off at police officers.
No excuses period. Clamp down on it. Save people's property and livelihoods. Restore law and order.