All those cops who participated should be in jail. The two most antagonistic cops should be in jail for life. They murdered that man. He was trying to get his life together. Just trying to have a good time. They picked the first damn Black guys they saw but didn't think to chase after the White dude who started the damn fight.
Dude shot him and still put him in cuffs. Stuffed everybody on the train so there would be no witnesses. The cops were more worried about saving their own asses than getting him help (i.e. putting pressure on his wound).
This is why people say fuck the cops.