Safety officers who sat by while a man died? Yep, sounds like they ought to be charged.
Fun fact: I used to have a job where I was licensed to perform restraints. We had extensive training, regularly renewed, because it's well known that people can asphyxiate in a prone restraint even if they're still able to yell. Every time we were trained, the trainers emphasized that we could be criminally liable if a person were injured or killed during a restraint, even if we were merely observing the restraint.
. . . but you digress. Those were actual deputized officers. The 17-year old was a vigilante with a gun looking for trouble, what most people would call a "thug".
