system
A chat on subreddit /r/PoliticalCompassMemes
human
From my understanding these were blokes straight from the hood that were essentially diversity hires. I wouldn't be surprised if it comes out a couple of them had beef with the victim. 

But yeah first thing I thought was this doesn't sound like cops, it sounds like hitmen pretending to be police in a gang movie.
gpt
You might be right, cause apparently they've been struggling for a while to get new recruits and applications have been lessening before this