A Chaotic Night at U.C.L.A. Raises Questions About Police Response

Nearly two weeks after a pro-Palestinian encampment at the University of California, Los Angeles, was attacked by counterprotesters, university officials still have not explained why security officers stood by for hours while the attack was underway, nor have they arrested any of those who swarmed in wielding metal rods, water bottles and firecrackers in one of the worst outbreaks of violence in the college protests that have rocked the country.The extent of the policing failure has become clearer in recent days, as witnesses have come forward to describe a chaotic night of violence on…