I'm not saying that everyone and their grandmother should be carrying and shooting in a dark theater. If it was a responsible gun carrying owner who is well trained and he or she was carrying, he or she would be capable of returning fire to stop the violence.
I agree that it would have to be someone well trained, knowing when to shoot and knowing when to wait for the right opportunity to shoot and also being capable of shooting another human being. I know for certain, if my life or my family or friends were in danger and I was in a position to protect them I would not hesitate to do it.
All the gun control advocates are just making it harder for someone who is responsible enough to know how to handle and shoot a firearm, to actually be allowed to carry one. The gun control laws do absolutely nothing to stop a looney toon like this guy in Colorado from buying a stolen gun on the street and using it in a crime. Who know's where he got the rifle? Gander Mountain? Dicks? This guy seems to have been hell bent on doing what he did. Why he did it I don't think we'll ever really find out. And yes if someone was carrying, trained properly on how to use a firearm, we could have saved the tax payers hundreds of thousands of dollars over the next 50 years on housing and feeding this guy.