There's an internet adage that goes, "Debating an idiot is like trying to play chess with a pigeon — it knocks the pieces over, craps on the board, and flies back to its flock to claim victory." It's funny and astute. It's also deeply, depressingly worrying. Although we'd never say so, we all have people in our lives we think of as a bit dim — not necessarily about everything, but certainly about some things.

Most of the time, we laugh this off. After all, stupidity can be pretty funny. When my friend asked a group of us recently what Hitler's last name was, we laughed. When my brother learned only last month that reindeer are real animals — well, that's funny. Good-natured ribbing about a person's ignorance is an everyday part of life.

Stupidity, though, has its dark side. For theologian and philosopher Dietrich Bonhoeffer, the stupid person is often more dangerous than the evil one.

The enemy within

In comic books and action movies, we know who the villain is. They wear dark clothes, kill on a whim, and cackle madly at their diabolical scheme. In life, too, we have obvious villains — the dictators who violate human rights or serial killers and violent criminals. As evil as these people are, they are not the biggest threat, since they are known. Once something is a known evil, the good of the world can rally to defend and fight against it. As Bonhoeffer puts it, "One may protest against evil; it can be exposed and, if need be, prevented by use of force. Evil always carries within itself the germ of its own subversion."

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