TEL AVIV—The body bags arrive by the dozen in a refrigerated truck first thing every morning. Some contain corpses, some only fragmentary remains, burned almost to ash. Another shipment usually comes before noon. Three weeks after the bloody massacre that killed 1,400 people in southern Israel, the cramped yellow building that houses Israel’s government forensic laboratory is still inundated with unidentified remains. The bags line the morgue hallway, on gurneys and the floor, spilling into an outdoor courtyard.…TEL AVIV—The body bags arrive by the dozen in a refrigerated truck first thing every morning. Some contain corpses, some only fragmentary remains, burned almost to ash. Another shipment usually comes before noon. Three weeks after the bloody massacre that killed 1,400 people in southern Israel, the cramped yellow building that houses Israel’s government forensic laboratory is still inundated with unidentified remains. The bags line the morgue hallway, on gurneys and the floor, spilling into an outdoor courtyard.WW…