The first raid came at five o’clock in the morning last May 17. Carlos Montes awoke to a thud. It was the sound, he soon discovered, of his front door splintering open. The sun had not yet risen, and Montes’s bedroom was dark, but in retrospect, he says, he’s glad he didn’t reach for a flashlight—or for a gun. Montes, a retired Xerox salesman, had kept a loaded shotgun behind the headboard and a 9mm pistol beneath a pile of towels on a chair beside the bed since the day he had walked in on an armed burglar a year and a half before.