Well that's funny, if you really "don't think there should necessarily be a lawsuit", then why did you first respond with a post that said "sue", and then later say that "In my opinion legal action is not a bad idea at all"?
The comparison with schoolhouse roughousing was exactly the point, the "violence" of this incident was incredibly minor, along with the intent, which was obviously not to seriously injure.  Yet you call it "police brutality".  Wake up, "police brutality" is getting smoked in the head with a baton.
The actions of the cop were totally reprehensible, but your attitude towards suing over something that minor is much worse.