A bit of a generalization there. Certainly the guy in question did something negligent in the handling of his gun, but it hasn't yet been established that he was carrying illegally, and even if he was I don't see how this could be directly tied to the ND.
How about people who take the Second Amendment literally, and choose to carry regardless of the "laws", does that make them stupid? Not IMHO.
I think this was probably some fine upstanding insurance agent, who believed in the 2nd, and carried for whatever reason he wanted, but should have learned more about handling his firearm.