O'Neal festival stopped after stabbing

I'm not a crowd control expert, but is cancelling an entire festival because of one incident really the best move to make?

A teenager got stabbed in the leg at the Southwark Park Festival, and - rather like a grumpy primary school teacher - it's been decided that that one piece of trouble is going to spoil it for everyone, and the whole thing has been pulled. Alexander O'Neal and all.

It was police advice which led to the early closure. It sounds rather like the Metropolitan Police panicked somewhat. Perhaps it's a pity they didn't advise the G20 to call it a day once there was the first sign of trouble.