But the rogue arsonist played a perfect part in a narrative that Fox largely invented, and has propagated relentlessly over the past two decades: the “War on Christmas,” a never-ending cultural conflict during which traditional, explicitly Christian celebrations of the holiday season are under assault from the sinister forces of secular pluralism. The fire was almost certainly not a political statement, having been set by a homeless man who recently exposed himself to reporters covering a trial elsewhere. Last week, a random New York City man made his mark on history by allegedly setting ablaze the 50-foot USA-themed Christmas tree outside the Fox News Channel’s headquarters.