If you're right and you aren't willing to actually communicate why, or worse, if you're right and you don't even understand why, you might as well be wrong.
If you're going to argue with people on the internet, and I know you are, either go full irony or actually take time to work out an argument that you know is going to be persuasive, none of this halvsies shit.
I was on the edge of becoming a leftist for like six months. That's literally how long it took for me to even be exposed to the idea that capitalism is bad for inherent and structural reasons, and not because of all the really obvious shit that liberals also disagree with but think can be reformed away.
Another example: people who are arguing that ACAB will correctly point out that police brutality rates are unacceptably high even with underreporting, correctly point out that police are a historically racist institution, then leave it at that.
All of that evidence is correct, but it does nothing to refute a "bad apples" reformist worldview. Unless you include the real, core police abolitionist arguments-- the ones that show the concept is utterly rotten with no regard for implementation-- you're never going to convert a liberal.
Or failing to mention that the first police were escaped slave catchers.