Professors have noticed a shift in their classrooms. Brad Wilcox, a U.V.A. sociology professor, told me that he believes that two factors have caused self-censorship’s pervasiveness. “First, students are afraid of being called out on social media by their peers,” he said. “Second, the dominant messages students hear from faculty, administrators and staff are progressive ones. So they feel an implicit pressure to conform to those messages in classroom and campus conversations and debates.”

The consequences for saying something outside the norm can be steep. I met Stephen Wiecek at our debate club. He’s an outgoing, formidable first-year debater who often stays after meetings to help clean up. He’s also conservative. At U.V.A., where only 9 percent of students surveyed described themselves as a “strong Republican” or “weak Republican,” that puts him in the minority.

He told me that he has often “straight-up lied” about his beliefs to avoid conflict. Sometimes it’s at a party, sometimes it’s at an a cappella rehearsal, sometimes it’s in the classroom. When politics comes up, “I just kind of go into survival mode,” he said. “I tense up a lot more, because I’ve got to think very carefully about how I word things. It’s very anxiety inducing.”