Scooter Braun, the high-profile music manager, helped bring the exhibit to the U.S. from Tel Aviv, where it was available to the public late last year as Israel reeled from the killings of more than 1,200 people. In an interview, Braun said he was deeply moved after having traveled to Israel, visited the kibbutzim where civilians were slaughtered and spent time with young Nova festival survivors. “I saw these 20-year-old kids singing and crying and laughing together and holding each other,” Braun said. “I felt this sense of anger. How could we ignore them? … I felt like we were...