You are an irrational person. Yes, you.
That’s not an insult. If you can read this, you’re a human being — and that makes you irrational. In fact, I believe — in all seriousness — that every human being is just a little bit insane. Some form of insanity is a universal “birth defect” among us.
One of the biggest mistakes we make in life is assuming we’re rational. What’s worse, we notice that other people seem irrational and stupid, but almost all of us believe we’re the exception. My way of looking at the world is right and rational. Your way is wrong and irrational. (You probably have evil motives, too.)
You are the hero of your own story. In your own mind, you believe you’re making rational and smart and sane decisions. You believe you have good motives, at least within the context of however you’ve justified your own actions.
I do exactly the same thing. And our mutual blindness about this whole charade leaves us with warped perceptions of the world around us — and of each other.

What did you want in childhood? Did you abandon those dreams?
Tired of Obama? Electing Romney or another Republican won’t help
Throwaway culture can leave us looking for something that lasts
Financial ignorance from your TV: Gold may not be around next year
When Demopublicans and Republicrats clash, you lose
Where are Obama’s tears when he’s the one killing innocent children?
I don’t like to admit this, but recent changes leave me afraid
UPDATE: Judge drops charges against Diane Tran; $100,000 raised