Shouldn't have resisted arrest the kneeing was unnecessary but punks shouldn't try evading the police. I hate that people generalize cops based on a few rough ones.
Idk what happened before the recording started, but the cops were out of line. Could the guy have cooperated better? Yes. But he wasn't trying to fight them or run away, and quite honestly he handled himself pretty well considering how inappropriate those cops were handling the situation. I would have resisted too if a cop treated me like that. Being a police officer doesn't make you better than everyone else and definitely doesn't give you the right to take advantage of your position of power (which the guys in this video were doing). They should be fired.