In the name of emotional well-being, college students are increasingly demanding protection from words and ideas they don’t like. Here’s why that’s disastrous for education—and mental health. ... Two terms have risen quickly from obscurity into common campus parlance. Microaggressions are small actions or word choices that seem on their face to have no malicious intent but that are thought of as a kind of violence nonetheless. For example, by some campus guidelines, it is a microaggression to ask an Asian American or Latino American “Where were you born?,” because this implies that he or she is not a real American. Trigger warnings are alerts that professors are expected to issue if something in a course might cause a strong emotional response. For example, some students have called for warnings that Chinua Achebe’s Things Fall Apart describes racial violence and that F. Scott Fitzgerald’s The Great Gatsby portrays misogyny and physical abuse, so that students who have been previously victimized by racism or domestic violence can choose to avoid these works, which they believe might “trigger” a recurrence of past trauma. ... The dangers that these trends pose to scholarship and to the quality of American universities are significant; we could write a whole essay detailing them. But in this essay we focus on a different question: What are the effects of this new protectiveness on the students themselves? Does it benefit the people it is supposed to help? What exactly are students learning when they spend four years or more in a community that polices unintentional slights, places warning labels on works of classic literature, and in many other ways conveys the sense that words can be forms of violence that require strict control by campus authorities, who are expected to act as both protectors and prosecutors? ... social media has also fundamentally shifted the balance of power in relationships between students and faculty; the latter increasingly fear what students might do to their reputations and careers by stirring up online mobs against them.