Only one question matters in the school violence debate: when a shooter is attempting to enter a school, what will be done to protect the lives of students and staff?
Asking what can be done to prevent mass school shootings is a secondary matter. Honest commentators — with the background and experience to know what they’re talking about — should be aware that in a constitutional republic, school shootings cannot be altogether prevented, and that gun control can have no effect. The worst school attack in history — in Beslan, Chechnya, leaving 300 dead and 700 injured — took place in a liberty-restricted state with democratic pretensions. Deterrence is possible, but not with past or current policies; the actual defense of the school during an incident is the heart of the debate.