How would you explain why cops are bad with a single one-liner?

I was chatting with an acquaintance earlier today. I said something to the effect of “I would consider it the worst parenting fail if my daughter became a cop”. This acquaintance then asked why that was, probably with about 50% indignation and 50% genuine curiousity.

Honestly, I kind of drew a blank. Like, I know how to explain it in a long post or like a missive, but I really couldn’t think of how to explain to someone who probably isn’t a leftist in just a quick comment. So I just went with:

“Well all they do is beat up on black kids”

Which… is of course correct. But tbh I fell that answer is just missing a lot. A beat later I almost said something about how cruel they are to homeless folks around here but by then moment had passed.

How would you all explain - in the span of a single one-liner - why cops are bad? I’m not looking to knock someone over with my impressive rhetoric or whatever. Not looking to convince them. Just so I can feel I articulated my position correctly. Just got my own sense of pride. Help me out here.