Everyone is human, and that doesn't change when you put on a LEO or military uniform. When I did the M9 qualification with the Air Force, I sat next to a woman who had clearly never handled a pistol in her life during the classroom portion. I gave her a great deal of extra help to get her to some basic proficiency; nevertheless I was very happy she was in the other group for live-fire. "They're only human" certainly doesn't excuse a careless mistake, but to just expect that it will never happen is unrealistic. When handling a firearm, no matter in what capacity, you absolutely need to obey the 4 rules at all times. As far as automatic termination for a ND, I think it should depend somewhat on the circumstances. The police chief should have some discretion; that being said, in those circumstances where an LEO does it in public and endangers people, I think the only answer is usually going to be termination. For military members, having something like that happen is generally a sure-fire way to get lit up like never before. Nevertheless, it still happens sometimes. Better to deal with the offenders than punish everyone, or paint all groups with a broad stroke.