Vanilla is a product of Lussumo:
Documentation and Support.

Rioting is imitative behaviour compressed and sped up. The people who study crowds will tell you that such behaviour is massively complex: it involves individuals with their own internal motivations reacting to groups, and groups reacting to the actions of individuals, and everything happening very fast. It's top-down and bottom-up, each feeding off the other. So it's always difficult to discern 'root causes' because these things taken on a momentum of their own. But the current riots seem peculiarly rootless compared to previous outbreaks, like the Broadwater Farm riots, when the grievances seemed clearer and more tangible.
Violent behaviour doesn't spread easily. In cities like London where security is relatively light touch - with roughly 200 people for every police officer - order relies on a kind of invisible contract among the people that live there. That's the basis of any community. It also relies on fear of punishment or public shaming. When people float free of the felt, tactile, social bonds of a community, they become more subject to influence from outside it.

