It was quite the weekend for Milo Yiannopoulos. After Friday night’s typically compelling sit-down with Bill Maher on HBO’s “Real Time,” the Saturday web buzz crackled with the news that the 32-year-old British provocateur had been named keynote speaker in the usually comfortable mainstream environment of CPAC. This came as a surprise to many, including some on the American Conservative Union board that oversees the event. A debate ensued over whether a speaker sure to energize some and repel others was the smartest keynote choice. Then Monday, the questions ran deeper, including but not limited to: Would Milo’s publisher cancel...