I mean that same argument also applies to any positions of power. Politicans are also responsible for this. cops are just the lowest ranking pawn, the politicians and oligarchs are the ones running the show. "ACAB" is an easy sentinment to latch on to, but it sounds like just a diversion so the working class forgets about the real issue.
Fuck the politicians. Fuck billionaires.
If cops = the gangsters/thugs on the street;
Then politicians = mob-bosses
If you hate cops, fine, I don't really have sympathy for them, but you should hate the rulling class 100x more.
If you kill a cop, another one will replace them, nothing changes.
If you kill a tyrant, however, maybe things can change for the better.
Its the same during war. People like the hate the pawns but forget who the real enemies are.
That is not to absolve the pawns for playing their roles as pawns, its a reminder to redirect you focus from merely "ACAB" and instead focus on "Eat The Rich".