“In one sense, the impulse driving these preparations is understandable. The prospect of mass murder in a classroom is intolerable, and good-faith proposals for preventing school shootings should be treated with respect. But the current mode of instead preparing kids for such events is likely to be psychologically damaging.” Erika Christakis in The Atlantic: Active-Shooter Drills Are Tragically Misguided. “In the 2015–16 school year, 95 percent of public schools ran lockdown drills.”