I think that gun "accidents" are so tragic, when most could be prevented with a little training and common sense. I suspect this one falls into that category.
I was raised in the country with a gun as my constant companion. My Dad taught me well; both as a gun user, and a bystander. It's been my observation that that often times the victim, had they been aware and gun knowledgeable, the accident might have been prevented. Even so, people do slip up. I actually was responsible for a friend getting a fragment in his butt because the bullet didn't completely penetrate the target, but splattered, a small chunk hitting my friend. My fault mostly.
I was almost deafened when hunting with several guys, some of whom I didn't know, when one guy behind me fired his shotgun very close to my ear. Guess I was lucky; if the guy was that ignorant, I could have lost my head. I violated one of my Dad's first rules; never let a guy with a gun get behind you.
I have also observed that country boys can be just as ignorant and careless as anyone else with a gun. I can't tell you how many times I have seen "unloaded" guns being waved around and pointed in the direction of others in an absent minded manner.