Emma, a 32-year-old publicist living in Manhattan who requested only her first name be used, entered therapy “almost immediately” after the 2016 presidential election. Like many people she knew, she says, she found herself distressed, anxious, and unable to sleep. “I wanted a place to vent, because my then-boyfriend was very unsupportive,” she says. When her new therapist did his own venting, though, “I raised my eyebrows,” she says. “It was somewhat comforting that we agreed, but he was quite unequivocal. And I thought to...