And, given what we know happened that night, the coroner would have been opening you up.
Key phrase there, "I would have removed the AR from him". That action was attempted, and the jury found his deadly response to be self-defense. Why couldn't anyone, I don't know, maybe have simply ASKED him what he intended to do with the firearm and then reported him to the police if they felt he was a threat, or failing that, taken his picture and simply reported to the police that there was someone carrying a rifle? Had no one attempted to physically accost Kyle, no one would have gotten hurt.