"When you pull the trigger, you've got to keep steady," the instructor sternly told the elementary school teachers. "If your hand is shaking you can't shoot." Teachers have one of the deadliest jobs in southern Thailand, with 44 killed by the bombs and bullets of an Islamic insurgency since 2004. So the teachers are learning how to shoot back. The Chulabhorn naval base... opened its heavily guarded gates on a recent Sunday to a training course for 100 public school teachers, mostly Buddhist men and women who say bringing a gun to school has become essential. "You'd never see a...