Nick Fuentes hit the jackpot. The white-nationalist influencer made it on the “Tucker Carlson Show,” the nation’s foremost vehicle for laundering noxious ideas into the conservative mainstream. Fuentes is a Holocaust denier and self-avowed racist whose goal is to remake the right in his image. Carlson, who prides himself on asking the supposedly telling questions when it comes to promoting any number of conspiracy theories, couldn’t really bring himself to ask any of Fuentes. Instead, he gave the 27-year-old Nazi sympathizer a tongue bath and said at one point of the Fuentes ideological project, “I guess you won.” This was...