Actually, I think that mayor is making sense, or would be in my part of the country. There are plenty of new gun owners around here; I'm one of them. :-) Some of those new owners are buying a gun, taking a CCW class, and then telling themselves that they're finished rather than getting any actual training with the gun. That's nutty for people with no previous experience with guns and no idea how to handle themselves in a self defense situation.
Granted, someone who has owned guns for years, shoots regularly at the range, and for some reason just wasn't carrying concealed might not need all the training a neophyte does. But I think you're assuming all Idahoans know guns. I'm not from Idaho, but I bet there are plenty of new owners there too.