Why the abuse?
Do I think that the service that is now understood to be the main force of these teenagers mobilising should have been interrupted for a temporary period of about 12 hours? Yes. Prevention is better than cure. I'm not talking about banning the service, just a temporary fix! If it was adults it wouldn't make much difference, but it was mainly kids who in my experience do indeed use BBM for 99% of their digital communication.
And in reply to the other poster - yes the parents of these kids usually do stump up the money for an expensive PAYG phone, there's a bizarre type of keeping up with the Joneses amongst parents in deprived areas to adorn their kids with new stuff to try to show they're not as poor as they are. Which is probably a contributing factor to all this but there we go