One thing to note is that ACAB doesn't mean that literally all cops are violent or white supremacists (Though many are. See: the 40% statistic)

It means that the system is bad and so all cops cannot help but be bastards because the system doesn't let cops do any good.

There's a story going around with a furry who seems to be close with a bunch of nazi furs claiming their dad committed suicide due to harassment from "the ACAB Movement "

No clue if it's true or not, but harassing random former cops is not helpful or even what ACAB means.

Don't trust cops. Many cops are crooked. But the real problem is that even if there are cops who are good people, the system is such that those cops are punished while violent, racist cops are protected.

The good cop will just watch and feel bad while the bad cop murders.

If you want to change things, put pressure on people who can actually do something about the power of police unions, eliminate the "thin blue line" mentality among cops that protects killer cops, and enforce the laws more stringently on cops than on the average populations.

Personally harassing random cops or people associated with them is a good way to make people dislike you and the effort for reform.

My father was a cop himself. He was a good person. And yet, from the stories he told me, he and his friends abused their power, casually, against people who had no recourse, because that was the culture.

Cops do things like that to drive off homeless people from certain places.

It's the system that is rotten. The department considers its job in this sphere to make sure homeless people "aren't a visible problem" rather than enforcing the laws, because that's how the politics work out for the chief and mayor, etc.

That filters down to the cops themselves

So cops don't look for people doing something illegal, they instead see a homeless person in a part of town they shouldn't be, and think of how to get rid of them. Because that's the signal coming down from higher up. That's the job as the bosses put it in.

Another good example is traffic tickets. It's a revenue stream for the cops, rather than about public safety.

Many departments have traffic ticket quotas, even if they're "unofficial"