South Park is notorious for skewering the PC liberal left, this season especially. It is far more likely than not that the “racist trigger happy cops” remark is something that one of the town’s lefty residents says in the course of the episode, shortly before being made to look like a complete idiot for doing so.
As I mentioned, I’ve not seen the series but hear about it from time to time. I just thought it another mindless TV show.Thanks for letting me know about what it’s about. Just might give it a squiz (as they say in Oz) ....