What happened in Asheville on May Day was not a riot, and not because of its size or any matter of scale. A riot expands. It is spontaneous, or it takes hold amidst a backdrop of social struggle. Countersummits provide the unique opportunity of a planned riot, because there is a larger crowd of people assembled there among whom the riot can spread, and the mass protest situation already creates such a logistical nightmare for the police that the risk, normally idiotic, of trying to start a riot right where the cops are expecting it is often neutralized. Generally, however, riots occur as a spontaneous response to the violence of the state or the humiliations of capitalism, as in Portland, March 2010, and Oakland, January 2009. Riots can be and often are provoked by a couple of people with more confidence in their ability to fight back, but their necessary characteristic is their expansion.
The riot is good because it is a catalyst, a magical spark that allows high social tensions to turn into open social conflict. It is a step towards social war. If, in a certain neighborhood, on a certain day, there is no simmering social tension, there will be no riot. On the other hand, if the people are well trained in obedience, the tensions can be boiling over but the lid will not fly off. The threshold for the transformation to a riot is lowered if people have confidence, if they have practice in fighting back. They can win these things through the attack.