376 boys in blue sat around and let 19 kids and 2 teachers die

Sorry that acronym is already in use.

Pig Officers Are Corrupt

Shorten it to POC to really piss them off.

I think it would be funny to use "PAC" for "Police Are Cowards" and it will get mistaken for "Political Action Comittee" by some police officer who will then beat up a lobbyist.