The reason ACAB is justifiable is that policing, at least in a modern capitalist society, is so fundamentally broken that to even join the force you have to make a serious moral compromise. You can claim you’re fixing it from the inside, you can try to keep to yourself, but no matter what you do, by the act of signing that initial contract of employment you’re participating in and materially supporting the violence arm of your local elites.

I’m sure you’ll see the light by then.