One of the biggest deflating sentiments that ruins the ACAB meme is the one-two question:

"Do you think you are a good person?"+"Do you want to be a cop?"

If they're answering truthfully, most ACABers would answer: "Yes."+"Of course I don't."

The reasoning behind the latter varies, in my experience with them, from "Because there are too many bad cops (therefore I am afraid for my personal safety)." to "Because I qualify for better jobs."

The former is, frankly, an argument from a place of cowardice. Imagine a world where nobody put out fires because fires are dangerous. Sure, it's totally rational for one person to avoid danger, but if everyone avoids danger we are all screwed. Further, though no group is a monolith, you also see "Cops always protect their own no matter what," come from ACABers, at which point wouldn't that person trying to be good be one of those cops that is above any adverse action?

The latter is an argument for incentivizing good people to join law enforcement, most directly with better pay, and indirectly with not shitting on every cop just because one/some/most/etc. of them are shit.