Thanks for the lectures but you are both talking rather vaguely about some new order without being very specific about how it's going to come about and how it's going to work when it does.
Easy concept, difficult to actually put into practice.
The point here is that the whole ACAB thing refuses to deal with the problem - it's lazy thinking as far as I'm concerned. Even if we accept that what it really means is "ACAB until we have brought about a new social and economic order", well, all it does is state that we need a new social and economic order without having to actually explain how that is going to appear and function. Meanwhile, it shuts out any discussion about how to improve the police force we have under our current system, and ignores the fact that many members of the police would probably agree that there are changes that should be made.
Additionally it's directed at individual police officers personally - what's this supposed to achieve? It's not those individual officers who decide to make the horse charge or whatever, it's those who command them, and indirectly, those institutions of the state that you want to get rid of. Likewise it's not really the individual officers who decide what level of police violence is "acceptable" when dealing with protests, even though it might be them that carry it out. Ok, so "just following orders" is by no means a justification for anything, but what is the point of directing anger at individual police officers (and I mean mainly in the context of sitting at home typing ACAB on the internet, not in the context of being face to face with them at a protest).
What's it supposed to achieve - make enough police officers uncomfortable enough about their role that they quit to be replaced with folk that have an even more mercenary attitude to their work? Demoralise those that genuinely want to do good stuff in those roles which are socially useful?
eta
Crispy is right, this should be on another thread though rather than disrupting this one.