What is the saying....
Guns don't kill people....People kill People
This is more of an indictment on our identification and proper treatment of mental illness as part of our medical care in this country, than it is a 2nd amendment discussion.
I heard that his mother called the Aurora police when she heard to tell them they had the right guy....Obviously she knew he was a loose cannon and might be capable of such a heinous act. Her ability to do something about it is another story...