The trailer for Tucker Carlson’s special about the Jan. 6 mob at the Capitol landed online on Oct. 27, and that night Jonah Goldberg sent a text to his business partner, Stephen Hayes: “I’m tempted just to quit Fox over this.” “I’m game,” Mr. Hayes replied. “Totally outrageous. It will lead to violence. Not sure how we can stay.” The full special, “Patriot Purge,” appeared on Fox’s online subscription streaming service days later. And last week, the two men, both paid Fox News contributors, finalized their resignations from the network. “I’m game,” Mr. Hayes replied. “Totally outrageous. It will lead...