I'm not sure what the reasons are behind the riots, but I'm sure that they are not "random" and (haha) "isolated" as the BBC often puts it. The interview here shows the BBC "reporter" asking leading questions to attempt to deceive her audience and to curve the conversation to fit a pre-determined story. She attempts to discredit him on numerous occasions. Her behavior is childish and irresponsible - and THAT is the deeper issue I see here.
I don't know why the riots are happening the way they are, but the police and the BBC (and most other media) are handling it very poorly. There are deeper issues, whether you like that fact or not.