In 2011, we had a not dissimilar incident in Tottenham Hale, and the riots lasted five days. In 2005 a similar stop-and-shoot had occurred in Mill Hill, and the officer responsible was only charged with murder a couple of weeks ago.
The problem is a difference between entitlement in the eyes of the young and in the eyes of the Police. If the Police won't hold themselves ot account for their actions, then the locals consider there is no society and prove their point at the cost of the community.
I don't think the UK has anything to teach you, therefore. Do we live in a democracy or do we live in a Police State? Many symptoms argue the latter, and it does tend to come from the US, for example in the heavy-handed application of anti-terrorism laws in areas they were not intended to apply to, and the escalation of force on and us-and-them basis where "them" somehow comes to include the rest of society (who pays for it, into the bargain). Shouldn't be that way, of course, but we definitely see the same disconnect on the ground here in North London.