Look ma, no guns!
http://en.wikipedia.org/wiki/Timothy_McVeigh#Oklahoma_City_bombing
You don't need a gun to kill people. Any nutjob hellbent on mass murder will do so with whatever is at his disposal. Just as easily as he walked in to that theater with guns and rifles, he could have done so with a bomb strapped to his chest. What would your silly gun laws have done in that case?
Would the world be a better place if guns were never invented? Maybe? But they're here. And they're here to stay. Nothing you or I or any politician can do or say will change that. EVER. Guns will not be banned in this country. You don't need to like the 2nd amendment, but you need to live with it. Get over the gun-free fairy tale and move on with your life.