But these complications do not fully explain the sheer rage generated by Silver. The furnace-hot backlash seemed to be triggered by Silver’s assumption that school closings were not only a mistake — a possibility many progressives have quietly begun to accept — but an error of judgment that was sufficiently consequential and foreseeable that we can’t just shrug it off as a bad dice roll. It was a historic blunder that reveals some deeper flaw in the methods that produced it and which demands corrective action.