There's plenty of better slogans out there. I'd support "end police violence" or "stop killer cops" or something.
Thats certainly much more catchy than the full slogan right now, which seems to be "Defund the police, but we don't really want to do that, even though some people in our movement actually do want that, but they're a minority - we swear. But we want political power anyway and it'll be fine - you can trust us".
You can tell its a bad slogan because of how much oxygen gets spent explaining it. (Eg, right here)