Helicopters hover low over the desert, their whirling blades chopping furiously, creating truncated tornadoes of dust and swirls of confusion as searchlights zero in on desperate disoriented souls, running for the border, running for their lives.Amid the melee, one of them kneels in a beam of light and lifts his eyes heavenward. Spreading his arms in a messianic gesture, he detonates the explosives strapped to his chest …