I've seen gun threads on other sites quickly deteriorate into threads that get locked or deleted because of the vitriol on both sides, so I will try not to be too judgmental. However, having said that, unless I can see that someone is a hunter, I am suspicious of someone carrying a gun, but not the reason you might think. In my mind and I'm sure this will draw some criticism, but I can live with that, people carry guns, especially handguns, for two reasons - one, they intend to harm someone or some animal, or two, more likely, they are afraid and think the gun will protect them. People who are afraid often make bad decisions. Happens all the time. My concern with guns in national parks, or anywhere else while hiking or camping is being shot by some paranoid, inexperienced camper who thinks that he or she is going to die or be hurt unless they are armed and pull their weapon as soon as they hear a noise in the dark. Call me paranoid, but I really wish armed hikers was not something I have to worry about.
I used to live in New Zealand, where guns are strictly controlled. No one seems to be worse off or less free because of these restrictions. Hunters still hunt, in fact the only time I saw a weapon down there was in the hands of a hunter. It never crossed my mind that while I was hiking, someone down there other than a hunter would be armed. Not to say there isn't gun violence there, but nowhere near the scale as here.Oh, telling me not to worry because all of you with guns are trained, etc. won't help because that's just not true.