I'm right; you're evil

Opponents of the war believe passionately that President Bush, his neoconservative allies and a complicit Congress deliberately misled the nation into war. Supporters of the president and the war concede that mistakes were made, especially on the question of whether Saddam Hussein had weapons of mass destruction, but say this involved no attempt to hoodwink the nation.

Antiwar groups declared that the Libby trial laid bare the Bush administration's smear campaign to discredit a war critic -- and said they hope Libby is just the first in a long line of officials to be punished. Supporters of the administration and the war declared the trial showed that Bush had done nothing to mislead the nation and that war opponents are being paranoid.

What is interesting about the clash from a psychological perspective is not that supporters and critics disagree, but that large numbers of people on both sides claim to know the motives of people who disagree with them. When was the last time you heard people say that those who disagree with them on the Iraq war are well-meaning, smart, informed and thoughtful?

A wide body of psychological research shows that on any number of hot-button issues, people seem hard-wired to believe the worst about those who disagree with them. Most people can see the humor in such behavior when it doesn't involve things they care about: If you don't care about sports, for example, you roll your eyes when fans of one team question the principles and parentage of fans of a rival team.

"We are really bad about putting ourselves in other people's places and looking at the world the way they look at it," said Glenn D. Reeder, a social psychologist at Illinois State University who recently conducted a study into how supporters and critics of the Iraq war have come to believe entirely different narratives about the war -- and about each other. "We find it difficult to grant that other people come to their conclusions in good faith if they reach a conclusion that is different than ours," he said.

When Reeder and his colleagues asked pro-war and antiwar Americans how they would describe the other side's motives, the researchers found that the groups suffered from an identical bias: People described others who agreed with them as motivated by ethics and principle, but felt that the people who disagreed with them were motivated by narrow self-interest.