"The expansive use of trigger warnings may also foster unhealthy mental habits in the vastly larger group of students who do not suffer from PTSD or other anxiety disorders. People acquire their fears not just from their own past experiences, but from social learning as well. If everyone around you acts as though something is dangerous—elevators, certain neighborhoods, novels depicting racism—then you are at risk of acquiring that fear too. The psychiatrist Sarah Roff pointed this out last year in an online article for The Chronicle of Higher Education. “One of my biggest concerns about trigger warnings,” Roff wrote, “is that they will apply not just to those who have experienced trauma, but to all students, creating an atmosphere in which they are encouraged to believe that there is something dangerous or damaging about discussing difficult aspects of our history.”"