There are three types of cops. Those who are abusing their power, those who say nothing when others abuse their power, and those who are so clueless they don’t notice the ones who abuse their power. Where are the good cops? Driven out of the force or killed, usually.
Also, it may come as a surprise to you, but people don’t choose to be people (and not all people choose to be crimo, whereas all cops have chosen to be cops, so your analogy is hopelessly flawed.