I can�t comment on this because I�m unaware of this particular incident.
The only thing I will say (and I echo what VHG said earlier) is that when you�re on the front line and some drunken lunatic needs to be arrested for whatever reason, it�s very easy for people who have never had to carry out an arrest to look on and say, �ohh, that�s a bit excessive�.
Believe me, some people are so intent on not being arrested that they will spit, kick, punch, etc. police officers. Having been there, I think it�s entirely reasonable to use force to subdue a suspect. At the end of the day, police officers want to finish their shift in one piece and as such, they often go in mob handed to arrest someone because it�s the safest course of action.
I�m not sure what you want the police to do. In order to carry out their job, they sometimes have to use �reasonable� force. What is reasonable to one person is unreasonable to another. The police often have to make split second decisions. It�s very easy after the event to say, �they shouldn�t have done that�, but hindsight is 20-20 isn�t it?