As far as I'm concerned owning an automatic rifle is slightly questionable for say. Just the gerneral population these days has no real self control nor do they have any logic/reasoning. A person could own one just for bragging rights or for a little fun at the shooting range, but if something were to happen that drove the person past there limits I would not doubt for a second that use of the weapon in a disorderly fashion could possibly occur. I really do not see how it's any different owning a 6 shot magnum pistol compared to a 45+ magazine automatic rifle. They both kill the same do they not? One may be quicker than the other and have more range than the other but there exactly the same, gun poweder in a shell with a primer and a metalic round bullet at the end.
This is just my view on the topic and what I have observed over the past few years.