Certain categories of us are more crucial to our identities than the kind of car we drive or the number of dots we can guess on a slide—gender, sexuality, religion, politics, ethnicity, and nationality, for starters. Without feeling attached to groups that give our lives meaning, identity, and purpose, we would suffer the intolerable sensation that we were loose marbles floating in a random universe. Therefore, we will do what it takes to preserve these attachments. Evolutionary psychologists argue that ethnocentrism—the belief that our own culture, nation, or religion is superior to all others—aids survival by strengthening our bonds to our primary social groups and thus increasing our willingness to work, fight, and occasionally die for them. When things are going well, people feel pretty tolerant of other cultures and religions—they even feel pretty tolerant of the other sex!—but when they are angry, anxious, or threatened, the default position is to activate their blind spots.
