Why do people punish wrongdoers when they are not personally affected? Researchers on costly third-party punishment have long debated whether such behavior reflects strategic self-interest or a moral commitment to fairness and justice. Recent developmental evidence offers important insights into this question. We argue that the origins of costly third-party punishment in early childhood are best explained by nonstrategic moral concerns. Young children selectively punish norm violators, incur personal costs to do so, and intervene even when they stand to gain nothing-often without reputational incentives or expectations of future benefit. Empirical studies indicate that children's punishment is driven by egalitarian norms, retributive motives, and efforts to alleviate victims' distress. In contrast, strategic motivations, such as reputation management and self-protection, appear only later in development. These findings challenge the view that third-party punishment is grounded in self-interest and instead support the idea that a concern for justice underlies the earliest forms of human norm enforcement. We conclude that whereas strategic considerations may shape punishment in adolescence and adulthood, they build upon an early-emerging moral foundation centered on fairness and justice.
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