Suppose you have to decide on something. Who’s responsible for some action? What exactly happened? What kind of intention stands behind one’s attitude?
If you’re biased, and we all are, the chances are good you’ll come to wrong conclusions.
You’ll treat the situation as organized by some leader while they are people who self-organized themselves. You’ll see protest instead of support. You’ll see bad intentions instead of simple lack of understanding what’s happening around.
You look at someone’s situation and you think what you would do if you were him. Then you imply others are doing things you’d do. And most likely you’re wrong. Because you’re biased. We all are.