What does not appear warranted was a continued restraint like the officer did on his neck.
Again, I will reiterate, anecdotally, that the cops I spoke to about this seem to think that he was probably restraining him so he did not cause himself more injury. The ambulance was already nearly there, and perhaps it was determined to leave him thus rather than to fight getting him into the car sommore.
I DO agree with a failure to render aid. I DO agree the cop should have attended him.
But that assumes he knew. For all he knew the guy passed out, if he knew at all. Maybe he thought he had just calmed down.
That I think is probably true. I do not believe that decorated cop would purposefully kill a man in full view of a crowd full of cameras. Likewise I do not believe he broke protocol, for the same reason. The same goes for the other cops involved. I do not believe they would intentionally disregard his fate, if not for their humanity (which I would presume) then for the bare fact they were being filmed.
I hope that cooler heads will prevail.