“So what happens when students get the message that saying the wrong thing can get you in trouble? They do what one would expect: they talk to people they already agree with, keep their mouths shut about important topics in mixed company, and often don’t bother even arguing with the angriest or loudest person in the room (which is a problem even for the loud people, as they may not recognize that the reason why others are deferring to their opinions is not because they are obviously right).”