The mainstream media failed to see the rise of Donald Trump in 2016. Now it’s overlooking another grassroots movement that may soon be of equal significance— the growing number of liberals “taking the red pill.” People of all ages and ethnicities are posting YouTube videos describing “red pill moments”—personal awakenings that have caused them to reject leftist narratives imbibed since childhood from friends, teachers, and the news and entertainment media. You might say that those who take the red pill have been “triggered.” But instead of seeking out “safe spaces,” they’re doing the opposite, posting monologues throwing off the shackles...