Chapter 11: Us Versus Them

Sapolsky investigates one of the most powerful drivers of human behavior: the division of the world into in-groups (“Us”) and out-groups (“Them”). Sapolsky shows how quickly and unconsciously these dichotomies form. Within milliseconds, the brain processes race, gender, or status cues, activating the amygdala for fear or the insula for disgust. Even minimal group experiments—such as assigning people by coin toss—trigger cooperation with Us and bias against Them, proving how arbitrary yet deeply ingrained these divides can be. Hormones like oxytocin further intensify parochialism, fostering generosity toward Us while heightening aggression or distrust toward Them. The chapter explores the strength of Us/Them boundaries, from childhood development (infants better recognizing same-race faces) to cross-species evidence (chimps and monkeys showing bias against outsiders). Symbols and markers like clothing, accents, or flags often become infused with meaning, turning arbitrary differences into sacred identities worth fighting for. Us-ness is tied not only to superiority but also to obligations, reciprocity, and loyalty, which can sometimes be expressed by harming Them. Studies reveal how people forgive in-group members more readily, punish Them more harshly, and even rationalize stereotypes or scapegoat others to maintain group cohesion. Sapolsky contrasts stereotypes of Them: threatening, disgusting, ridiculous, simple, or cold and competent. He draws on Susan Fiske’s stereotype content model, showing how perceptions of warmth and competence map onto predictable emotional responses: pity for high-warmth/low-competence groups, envy for low-warmth/high-competence groups, disgust for low-warmth/low-competence groups, and pride for Us (high warmth/high competence). These categories explain responses to marginalized groups, elites, and rivals, and even the cruelty of degrading high-competence out-groups before persecuting them. The chapter also highlights the fluidity of Us/Them boundaries. Multiple identities—race, gender, occupation, religion—shift in salience depending on context. Subtle reclassification, like grouping by shirt color instead of race, or finding shared values, can reduce bias. Historical anecdotes, from Masons at Gettysburg to the Christmas truce of World War I, illustrate how common identity can override entrenched divisions. Yet essentialism—the belief that groups have immutable essences—fuels the most dangerous forms of Them-ing, justifying exclusion and violence across centuries. Sapolsky further explains how cognition lags behind affect: stereotypes often arise from unconscious emotions, with rationalizations built afterward. Studies show how priming, contact theory, perspective-taking, and individuation can reduce bias, but hierarchy and inequality exacerbate it. Individual differences matter, with social-dominance orientation and authoritarianism predicting greater prejudice. Ultimately, Us/Them-ing cannot be eliminated—like stress, it is intrinsic to being human. But it can be shaped. By recognizing our automatic biases, practicing perspective-taking, emphasizing shared goals, and resisting essentialism, humans can channel group identity toward cooperation rather than division.