Man's inhumanity and disbelief will never stop God from being where He is. People always want to question God as to why He doesn't step in and stop this from happening to begin with.
What people need to realize is that God sent angels to protect most of the people in that theater or else the death toll would have been higher than it was, even though 12 dead is still too many.
We'll find out later what drove this young man to do this, but people really need to learn to trust their instinct and recognize signs.
Destructive behavior is a cry for help that too many people ignore until it's too late.