Screenings happen in Hollywood every day, but there has never been a screening in Los Angeles anywhere close to “Bearing Witness,” the uncensored collection of video clips of the Oct. 7 massacre of 1,400 civilians in Israel. Before leaving my West Hollywood home to attend the screening, I paused. Did I really want to see the murder of innocent people on the silver screen? Was it ethical to watch people butchered in broad daylight? I reluctantly left, grabbing a black yarmulke on the way out, not sure if I was attending a film or a funeral. The auditorium slowly filled...