You know, if all human beings were mentally balanced and nice people, I don't think I'd mind anyone having guns. The problem is, if you look at these guys at these NRA events, you already know they are massive a-holes, just itching for someone to come onto their property so they can use their guns.
I also have a problem with people who think they need guns to protect themselves from their government. Essentially, that means they don't agree with the unwritten social contract that we all have to play by the rules if we want a stable society, which makes them immediately untrustworthy in my book.