I think part is scare tactics to stop funding to the Police service, but alot of it is just the truth there are so many young people and not so young who are totally disenfranchised with society we can all say like many people did up and down the country during the Riots. Sort your life out get on your bike but i could imagine while some simply can't be bothered,a lot are just lost in despair.
I think the rain is possibly helping stop any major issues so far but now that we have had an example of the police losing control and for the most part those involved not getting any grief. Its always a possibility it can kick off again remember when your young and you did some foolish or fool hardy things (nothing like breaking the law i am sure but taking risks i mean) well that's how the youth will look at it.