You won't get much of an argument from me on this point, but it wasn't their decision to make. Although I haven't read he had a history of violence, I do not delude myself into believing he was a choir boy.
He had been previously arrested as a Juvenile (under 18) for armed robbery, which was plea-bargained down to possession of a firearm in a prohibited place (a HS football game). He was on probation and was reportedly in violation of that probation at the time of his death.
Definitely not a choir boy.