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What makes someone join Al Qaeda? In the case of Abu Yahya al-Libi, the Al Qaeda luminary killed in an American drone strike in Pakistan last June, his older brother has no doubt. Americans are culpable for his sibling’s embrace of terrorism. He draws a direct line between al-Libi’s recruitment by al Qaeda and the suffering he endured at the hands of American interrogators using techniques similar to those portrayed in the movie Zero Dark Thirty.