The problem with "not all cops are bad" is that it means that you don't recognize the power of a fundamentally corrupted and oppressive structure over individuals.

That means that you believe that people's behaviour within those structures is decided by themselves individually, and that makes you vulnerable to "good cop, bad cop" strategies.

And *that* means that I simply cannot trust you not to rat out me or my friends when the rubber meets the road, maybe even without realizing it. That I cannot trust you to have my back when cops come for me.

It doesn't matter how good your intentions are, or that you believe this out of fear for a world without police, or that you think you can separate the good ones from the bad ones.

None of that matters for the simple fact that if you make this choice, I cannot trust you with my safety.

(And when people take issue with you being friendly with cops, *this is why*.)