When Yuval Abraham and Basel Adra walked onstage at the Berlin International Film Festival on Saturday night, they had come to talk about more than movies. Abraham and Adra, an Israeli and Palestinian filmmaking team, had just won the festival’s award for best documentary for “No Other Land,” a movie about Palestinian resistance to Israeli campaigns in the occupied territories. It was “very hard,” Adra said, to celebrate the award “when there are tens of thousands of my people being slaughtered and massacred by Israel in Gaza.” He called upon German lawmakers to “stop sending weapons to Israel,” before Abraham...