In the wake of the tragic shooting deaths at Sandy Hook Elementary School in Newtown, Conn., last month, the National Rifle Association proposed that the best way to protect schoolchildren was to place a guard — a "good guy with a gun" — in every school, part of a so-called National School Shield Emergency Response Program. Indeed, the N.R.A.'s solution to the expansion of gun violence in America has been generally to advocate for the more widespread deployment and... (GunPolicy.org)