Think of your 12 closest friends. These are the people you vacation with, talk about your problems with, do life with in the most intimate and meaningful ways. Now imagine if six of those people suddenly took a political or public position you found utterly vile. Now imagine learning that those six people think that your position is utterly vile. You would suddenly realize that the people you thought you knew best and cared about most had actually been total strangers all along. You would feel disoriented, disturbed, unmoored. Your life would change.