Nonsense. Automatic weapons are far from impossible to obtain, yet their use by criminals is negligible. Nor are they necessarily so damn deadly as some think.
My Class III vest can stop bullets from a typical submachinegun, like an Uzi, no problem. A 30-06 bolt-action deer rifle will go right thru my vest like it isn't there and kill the **** out of me in between.
I'm an American, and bearing arms is a Constitutional right: I don't have to have a "reason" to have an autofiring weapon other than "I want one", and the only qualifications I need are "I'm not a felon or a nutter."