Moral Tribes

Résumé du livre

Joshua Greene studied philosophy at Harvard and Princeton universities and has since worked as a neuroscientist, psychologist and philosopher. His research has been featured in the New York Times. He is currently a professor of psychology at Harvard University.

Humanity’s biological nature remains unchanged despite rapid societal evolution, and while we excel at cooperation within groups, conflicts between groups persist, as seen in historical patterns. The tragedy of the commons highlights the tension between self-interest and collective good, illustrated by Art and Bud’s fatal mistrust in the Wild West. Similarly, the tragedy of commonsense ethics, exemplified by the 2005 *Jyllands-Posten* cartoon controversy, shows how clashing group values can lead to violence. Ethical dilemmas like the prisoner’s dilemma reveal how relationships and future consequences influence decisions, often favoring self-interest over mutual benefit. Moral reasoning operates in two modes: automatic, driven by intuition, and manual, guided by logic, as demonstrated by a study where cognitive load affected snack choices. Debates like abortion reflect competing values—women’s rights versus the sanctity of life—where utilitarianism suggests prioritizing societal well-being but risks overlooking individual rights. Empathy, shaped by proximity and personal connection, explains why people respond more strongly to individual tragedies than distant disasters. Finally, utilitarianism’s focus on maximizing happiness, as seen in thought experiments like the footbridge dilemma, raises concerns about sacrificing individual rights for the greater good, underscoring the complexity of ethical decision-making.

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