It was a Friday night in early November and Fox News host Tucker Carlson was preaching to the camera about leftists sowing “racial divisions” throughout America. Reacting to an article in The Washington Post about a principal at a Maryland high school investigating an incident in which someone posted fliers proclaiming, “It’s Okay to Be White.” Carlson claimed to see evidence of an anti-white agenda at play in the Post report. The segment was typical Fox News fodder, but with an exception: Carlson was pushing forward a meme promoted by white supremacists, and he was doing so exactly as they...