As far as I can tell this was an accident ~ i.e., exacerbated by stupid people doing stupid things. Apparently, morons aren't restricted to Florida.
I've seen it before:
When I lived in Arizona a "has been" actor was showing off his fast draw and gun twirling skills for a pool party audience. The gun went off when he tried to flip it back into the holster and he shot himself in the calf of his leg. The hospital reported a gunshot wound to the police. The gun wasn't licensed and neither was he. He did some time for public endangerment.
Dumb, dumb and more dumb.
The last I heard he was driving a produce truck for some warehouse in Chicago.
So much for playing cowboy games when you only play one on TV.