I can't say you are wrong, but I will say that I think it's unfair. The owner didn't put the live round in, although he hired the guy that did. As I said in #63, we all have bad days, off times and we have all survived doing something very stupid. That's why "accidents" exist. Blame can be placed on just about every one, but we tend to overlook the everyday stuff because we have all been there.
This is not in any way excusing the action. The idiot using live ammo is wrong. The store owner who hired him? Heck, that could be any of us...
That of course, has nothing to do with 'fair', and the store may close just from the liability costs resulting from this.
So be it.
Fair or unfair isn't a high enough standard when you are dealing with deadly weapons. I know AD's and ND's happen and there is always an explanation. None are acceptable, particularly if someone is hurt. If someone is killed or injured, sorry doesn't cut it nor do excuses. Anyone who takes on the responsibility of handling firearms also takes on the responsibility of impeccable adherence to strict safety procedures. If not, they have no business handling firearms.