Guns and ammunition do not have any sort of mystical property wherein they operate differently from anything else that people can forget about or make a mistake about. If you would have sympathy if it were a set of keys, I don't know why this wouldn't apply to bullets, when you break it down the act is the forgetting which could happen with anything, right? There is negligence, and there is an honest mistake. I do think if this were a case where harm was done, that's a totally different story, they would need to be held responsible for that harm even if they didn't mean it, that's why there are different things to charge people with. It just feels like some are approaching this from an entirely vindictive place because guns, which idk I guess is not all that unsurprising really given the state of at least the US.