It's not about guns...it's about OUR ablility to recognize erratic behavior and being able to report it instead of hearing "well he hasn't done anything"....
We describe this as mental illness and that plays a part, however, it is simply our death culture. Confront evil and recognize that if the principal was armed this could have had a different outcome.
... and why is it that 2 years after the Ft. Hood massacre not only is this dirtbag Hassan still alive, his damn trial has not even started. What sort of message does that send to the nutcases in society except that you can get away with murder.