Automatic weapons are not hard at all to acquire. I can take my bushmaster ar15 and put a paper clip inside the receiver bent a certain way and bam. It is fully automatic. Taught my wife's brothers to do it when they were younger and pissed off my mother in law real bad. I served in the army and know assault rifles well. There is no reason a civilian needs access to this kind of gun. They are called assault rifles because they are designed for assaults.
I am all for gun owners rights but do not believe we should be able to own certain weapons.
That said, most mass murders are committed by the person who is legally allowed to have guns.
It's a fucked situation