Say what?

In an article about the Metropolitan Police's botched handling of the G20 protests, something jumped out at me:

Chairman of the committee Keith Vaz said the public "clearly don't understand" the reasons for using kettling and other public order strategies.

"What's acceptable, what's within the police rule book - the use of distraction tactics, for example, slapping or hitting people - shocked the public," he told the BBC.

Wait. Unprovoked violent attacks on protesters is an official police tactic?

You're right, Vaz - I don't think the UK public quite understands that.