The other guy was in fear for his WIFE. He comes out of the store and this idiot - who probably wouldn’t have been so full of himself if he had been unarmed- was harassing his wife over what is not his business, but a matter concerning the management of the store.
The guy with the gun wasn’t in his own car getting assaulted. He wasn’t on his own property getting assaulted. His own wife was not getting assaulted. The business was not getting robbed. He was in the other guy’s parking spot with the other guy’s wife and kid in their own vehicle minding their own business and he escalated an argument far beyond the value of the dispute by not leaving after he had his say, probably because he had Facebook disease- a bad case of virtue signaling making him ridiculously self righteous. There are other people, no doubt, behind the guy who came out of the store who could be hurt; it was a public place and well lit. The guy who came out of the store wasn’t threatening any innocent bystanders and he would not have been a threat to the virtue signaler if the virtue signaler had not tangled with his wife.
SO if you were standing in line at the movies and some @sshole cut in line right in front of you, it wouldn’t be any of your business, right? You would just stand there and say nothing?