I gotta wonder how many riots are 100% anger. I mean, watch video of crowds rioting sometime. Sure, there are some pissed off people there. But I also see a lot of smiles. Those people aren't angry. They're having fun. I think riots attract a much larger, secondary group that uses the riot as an excuse to tear stuff up.

This is probably not true of all riots, or even true during the entire period of a single riot, or true in all areas of a riot, but I think the effect is there. A riot is interactive entertainment with the possibility of free gifts.

I've never understood how a crowd of fans of the winning team in a giving sport can tear up a town, but they do. No anger there... Excited, often drunk, people. A super saturated solution of idiocy just waiting for a reason to crystalize. Someone throws a rock through a window and...