I don't feel bad for the criminal but I still think that cop went a little overboard. I have no problem ruffing up a known criminal if you know he committed a crime, resisted arrest and basically being combative. But keep it to a reasonable degree.
Watch your head when getting in the...
I've had a few friends that were cops. And I mean few. With them and their buddies, if you were not a cop, you were a criminal they hadn't caught yet.
And in komifornia putting the deputies in the prison system as rookies, well that just breeds that mentality. Everyone is a criminal