School Safety: Critics of the National Rifle Association's call for armed security guards at our schools respond that one famous school did have a sheriff's deputy on scene. But without him, the toll would have been much worse. After remaining silent on the mass shooting at Sandy Hook, the NRA's Wayne LaPierre held a press conference Friday to condemn another tragedy in a gun-free zone and to advocate the placement of armed security guards at our schools as is done at airports, banks and other public venues. "It's now time for us to assume responsibility for our schools," he said....