I try to teach my son that there are very few "accidental deaths". Most people die from stupidity. By car, diving into shallow water, driving into the path of a train, negilence with a firearm, etc., etc. Calling it an "accident" is just being considerate of the loved ones of the person who died from stupidity and now have to go through the process of grief and burying the poor fool.
That guy who walked into your pawn shop almost died from stupidity. Kudos for the way you handled it threegun and thanks for relating the story.