I think this guy's Mom is more to blame than the guns.
Either she didn't safeguard her firearms from a member of her household with a history of mental illness, or (and this is just a wild speculation on my part) she bought her mentally ill son guns in her name.
It was disclosed today that his mother was trying to bond with her visibly disturbed son by sharing her gun enthusiasm with him. Obviously an ill-fated choice of ways to bond with him.
