I believe any sane person should be able to own a gun without asking permission from big-daddy(gubment).
Having said that, how do you feel about totally crazy, rolling their poop into little balls insane people going down to the gun shop and picking one up spur of the moment? You might say "well, the gun dealer is not forced to sell a gun to him". Ok, lets say the dealer is a dumb-ass and doesn't recognise the guy as being off his rocker.
Theres gotta be some kind of line, right? Or do you just let bat-shit-insane people get them and hope someone mows them down when the opportunity arises? I mean, I myself would be fine with that, but there are a whole lot more people out there that wouldn't be.