We now know the murderer, although not the full motive. We also know the contours of the debate that will now rage. It seems an obvious misjudgment, to say the least, not to have had a more aggressive, immediate response to the first shooting. As for gun control, the debate shifts, I believe, when we're dealing with a campus. Whatever the pros and cons of gun control in general, I find the idea of a place of learning being filled with students carrying concealed weapons to be a deeply disturbing idea. It is the antithesis of civilization.