We can't answer that but we can know that no one would have been shot if we had not allowed the shooter to have a gun.
We? How do you, princess, know anyone "allowed" anything?
If "we" did not allow farmers to have nitrogen; there would not be ANY nitrogen in the Gulf.....Uh-huh....right!!!!! See how your logic works? I believe I've posted something about sources of nitrogen on this before.
At any rate; no one is screaming for banning the semi-auto pistol announced as the weapon for this latest shooting. It must not look like a military assault-style weapon. Why do looks trigger banning cries?