I think you need to check your premises. This man was not a criminal. He was a West Pointer, a veteran, and an upstanding citizen of his community.
One other thing: I'm most certainly not a libertarian, and I am far from convinced this was a righteous shooting.
You don't have to be a libertarian to oppose law enforcement officers willy-nilly gunning citizens down in the street.
We weren’t talking about the victim in this case, but thanks all the same.