Professional Policing?

Further to the Dialogue with an Officer, below, who feels that the G20 Bishopsgate violence is wholly due to protesters and in no way due to the police tactics, take a look at this.
1:44 - officer lashing out with force.
2:08, 2:17 officer using edge of shield.

These people had nowhere to go. The police were not trying to move them on, they were trying to crush them. How can this be happening in Britain?


[Update 7 Nov 2009: Guardian: Culture of Impunity at TSG, 5000 complaints, 0.18% upheld. I rest my case.]