If you want to know how people change, read this post. Change your mind, change your mood, change your life. What follows combines two of my favorite subjects: the psychology of belief and the need for radical civility in political discourse. Doesn’t sound all that sexy, I admit. But understanding why we hate ambiguity is the key to understanding how people change – or don’t. It’s also key to how we got where we are in the state of political discourse.…