I may or may not make any friends here, but the person who shot should be indicted.
The second you take possession of the firearm it is on YOU to make sure it isn't loaded and maintain safe handling. I have never been in a gun store that the ceiling or floor was covered with people, point it there.
I almost wont go to a public range or a gun store anymore because by and large peoples firearm handling skills are atrocious, if i had a dollar for every time ive been muzzle swept or covered at a range/shop i could probably afford that Thompson sub machine gun I've wanted since i was a kid. I mean the general public is terrible! we wont even talk about the time the range was hot and some dude decided to walk down the side and get his target,,, claiming he made eye contact with everyone... people are idiots.
I could be wrong, but i think it was better back in the day when they taught such things in school.
And before anyone ask, yes id have the actor dude under the jail too.
This is terribly sad, but it was preventable and the ultimate responsibility rest with the person who was holding the firearm.