It’s been heartening these last few days to see the overwhelming majority of the American right dump on low-rent hate-monger Nick Fuentes — and on podcaster Tucker Carlson for credulously promoting him. Carlson’s interview last week with the Holocaust-denying, Hitler-loving alt-right edge-lord has so far racked up 5 million-plus YouTube views — perhaps a majority of them by people appalled by the episode. Appalled not simply that a once-mainstream conservative would platform the crank, but that he simply allowed Fuentes to rant about “organized Jewry” supposedly quashing criticism of Israel with barely a hint of pushback, and indeed added his...