I think when you get large groups of people, particularly when they belong to minority ethnic groups, who are mostly living in poverty and feel that they don't have any political power, stuff like this is going to happen. Clearly these people don't feel any sense of ownership of their own neighbourhoods or they wouldn't be causing destruction like this. It's an us-and-them thing, and if people feel that way then the only approach that will improve the situation is to try to include those people in wider society to a greater extent.
I'm not saying they shouldn't all get nicked for it, mind.