Think about it this way; you meet a cop in an unexpected situation. You do not know this cop. Should you trust that this cop has your best interest at heart, and treat them as a fellow comrade? Certainly not if you want to live!
ACAB because if you do not make that assumption, you will get killed by one of the bastards and they will get away with it. If you want to get deeper into philosophy, we can talk about how all cops are complicit in a system that grants them limitless freedom to terrorize the populace, making even the nice ones inherent class traitors, but the simplest truth is ACAB is a motto that keeps people alive.
This doesn’t really surprise me. Overwatch 2 is basically a momument to the rot at the core of Blizzard. Its biggest saving grace is that there hasn’t been a serious challenger in the hero brawler space (sorry Concord) until now.
For my money, I still think Deadlock is going to be the game that comes out on top, but it probably needs another full year to cook.