I would say that the police are getting a wee bit carried away. I don't know what happened in the lead up to the video being recorded but the reaction of the crowd and the couple behind the camera suggests that the chap didn't deserve what he got.
Reminds me of a post I published a while ago and this quote from it in particular -
Being the cynical bastard that I am, I think all the 'negative' publicity the police have suffered in recent times is a carefully orchestrated plan for an end game which has still to become apparent.tip of the manky bandage to Dazed n Confused for pointing me in the direction of the video
I think we are being conditioned into seeing the police as the enemy and the public are being whipped into a frenzy by some unseen group. The police are being manipulated too, with senior officers declaring that a summer of riots will soon be upon us and civil unrest training courses being thrust upon the rank and file. The regular frontline police all have itchy 'baton fingers' these days. Robust and firm policing tactics spouted by the police chiefs filter down the chain of command until it reaches the front line, where it seen as a license for thuggery.