1000 reasons? A dangerous myth that has led us into our present situation. Are there special exceptions? Yes, but they are very few and far between. Their exceptions to every rule, obviously, but that requires intelligent discretion exercised one incident at a time. And they are very rare.
In reality, all cops are power, abusing, fascist pieces of shit. That is the entire reason they became cops in the first place. If not, there would be no people to be cops. If they weren’t fascist psychopathic pieces of shit, there wouldn’t be people available to be cops, so, logically, the fact that there are police officers dictates the fact that they are all psychopathic monsters. If there is any evidence to the contrary, anyone is welcome to present it, but until anyone does, the logical conclusion is that anyone and everyone who is a police officer is and was recruited specifically because they are a psychopathic monster.