People prefer certainty. There's a psychological need to explain events or phenomena rather than accept one's ignorance, to say ???I don't know??? when faced with insufficient evidence.

A man fires a gun several times at the side of a barn and then draws a circle around a cluster of most of the bullet holes. Drawing a target retrospectively like this doesn't prove the shooting skills of the gunman ??? no one would consider him a sharpshooter if they knew what he'd done. When the equivalent of this happens in other circumstances we call it the Texas sharpshooter fallacy . As with many fallacies, it may not appear fallacious (...) at first inspection. (shrink)

Dene Bebbbington explains, and criticises, the intelligent design creationism of William Dembski.