The dog that didn't bark in all of this is the level of coordination between all of the cities participating and the fact that nobody in the media appears to want to pursue that angle. Certainly there was a great deal of natural coordination through the media themselves simply reporting the excitement, but what we actually saw goes far beyond that. This cost money. This required resources. And when I saw, as I did, a level of alarm and disgust across the political spectrum at the deliberate flame-fanning going on in the media I have to conclude that it's something more than the usual tribalism that so pervades the American political scene these days.
One is tempted to use words like "conspiracy" a little too freely, but when we see something like the Occupy movement spring up suddenly out of fallow ground, it's a little difficult to believe that there isn't some serious professional organization behind it.
They'll be back. Riots are fun for everyone but the victims.