...But as the members of the Intellectual Dark Web become genuinely popular, they are also coming under more scrutiny. On April 21, Kanye West crystallized this problem when he tweeted seven words that set Twitter on fire: “I love the way Candace Owens thinks.” Candace Owens, the communications director for Turning Point USA, is a sharp, young, black conservative — a telegenic speaker with killer instincts who makes videos with titles like “How to Escape the Democrat Plantation” and “The Left Thinks Black People Are Stupid.” Mr. West’s praise for her was sandwiched inside a longer thread that referenced many...