Yes, I'd like to second that sentiment. I think that was terrible, and to be honest I think I would feel exactly the way you do if something a fraction that bad had happened to me. I think it is reasonable for you to carry, especially if it allows you to get out there with less trepidation.
At this point I don't think I would have any problem with anyone carrying on the trail, especially not you.
I think it is in most cases unnecessary, and an argument can be made that, given the low probability of actually needing a gun, that with increasing numbers at some point the probability of a drunk, angry or otherwise messed up camper injuring me or someone else with a gun, instead of just screaming at me or something, becomes large enough to outweigh the possible need. Hence the argument for no guns in crowded areas like National Parks, movie theaters, or the inner city for that matter.
Anyway, in the view of the vast majority it is a balance thing, not black and white. But the fringe on both side always makes it about the people on the other side, and it isn't about debating the balance point for them. That point of view is boring and guaranteed fruitless - but more importantly dilutes the all important entertaining satirical and ironic posts. ;-)