But when a citizen doesn't behave well, if not illegally, as will happen in a free society, it is incumbent upon the police, the ones with the tasers and the handcuffs and the guns, to exercise discretion wisely and professionally. And when they don't, we shouldn't make excuses for them. It's far more corrosive to society to allow authority figures to abuse their power than the other way around.
Henry Louis Gates may have acted like a jackass in his house that day. But Sergeant Crowley arresting him for being "tumultuous" was an abuse of his discretion, a fact which is backed up by the fact that the District Attorney used his discretion to decline to prosecute. Racially motivated or not he behaved "stupidly" and the president was right to say so.
— GatesGate by Digby
This is pretty much my opinion on the matter.