They can declare it a riot all they want, but there is no putting this genie back in the bottle without a violent assault on the rioters, water cannons, rubber bullets, dogs and night sticks. Then arresting and prosecuting them enmass. call it tough love.
But we all know they don't have the stomach or the balls to do it.
The organizers and financiers also need to be arrested and prosecuted to the fullest extent of the law as well.