“We didn’t expect this backlash,” Yuval Abraham tells me. “We expected some backlash, but such an intense backlash from the highest levels of Israeli government has been not easy.”One can only imagine. A little over a month ago, Naza, a chilling documentary by Abraham and Rachel Szor, premiered to acclaim at Venice International Film Festival. Abraham, an investigative journalist raised in southern Israel, knew he was dealing with dangerous material. The formally daring film, comprising interviews with 24 Israeli military-intelligence officers and soldiers, investigates the systems behind the massed slaughter of civilians during the continuing assault on Gaza. It deals...