The very powerful and the very stupid have one thing in common. They don't alter their views to fit the facts. They alter the facts to fit the views. Which can be uncomfortable if you happen to be one of the facts that needs altering.
"I think my idea's better."
Lester asks, "What is your idea?"
"I don't know yet," the Doctor responds, "That's the trouble with ideas -- they only come a bit at a time."
-Both taken from Dr. Who