Because airplanes are so highly leverageable from a single act into overreactionary freedom-stifling societal damage. One shoe bomber and now billions of trave

Because airplanes are so highly leverageable from a single act into overreactionary freedom-stifling societal damage. One shoe bomber and now billions of traveler-hours are wasted shoeless at the checkpoints. Airplanes have so many eyes on them and every involved entity must overreact to prove We Are Doing Something. Grade schools wouldn't have the same impact because the control is more localized. There's no federal Education Security Administration imposing gropefests everywhere in response to Newtown. Some schools and places will overreact, but a small proportion.