As an Israeli volunteer who recovers corpses, Moti Bukjin has worked at horrific disaster sites for decades, but nothing readied him for the carnage Hamas gunmen unleashed on a desert music festival on Saturday.The scale of Saturday’s massive and multi-pronged surprise attack from Gaza has shocked Israel and amounts to the deadliest assault in the country’s 75-year history.One of the survivors of the festival attack, Ephraim Mordechayev, 23, said he was having “the happiest moment of my life” when the joy turned to horror.