[wizzwizz4]

> Bad people have to go free in order to incentivize good behavior by cops.

And they will, next time, and everyone knows it. We don't need an actual example of a bad person going free if the potential is certain enough.

Unless, of course, you're trying to encourage good behaviour in the general case (rather than a codified list of specifics); but that's expecting police officers to be experts in right and wrong. As obvious as such things are to me, I'm aware that a lot of people struggle a lot more with these things. (Or, perhaps, struggle less: I spend a lot of time thinking about morality and ethics, more than is reasonable to expect a salaried worker to spend.)