THEY came from all over. From the swanky suburbs of Amman, from ancient Jerusalem, Kuwait City and the United States to celebrate the union of their families. A day later, the wedding guests found themselves gathered together in mourning, around freshly dug graves in the sprawling cemetery where, one after another, 17 of those who had come in celebration were laid to rest. The bride and groom, Ashraf Da’as, 32, and Nadia al-Alami, 24, had been married less than half an hour when tragedy struck. Married in front of 200 guests, many of who had flown in days before for...