How personality shapes third-party moral judgment

Although recent research in the moral judgment field has explored third-party judgment, much less is known as to how personality influences these judgments. The present preregistered study addresses this issue by exploring the influence of various personality traits, namely honesty-humility, emotionality, and conscientiousness. Adult participants recruited online (N = 405) read short narratives describing the interaction between two protagonists (“agent” and “victim”). We manipulated the intent of the agent (intent to harm or not) and the outcome for the victim (harmful consequences or no harm). Participants indicated the extent to which they perceived the agent’s behavior as acceptable and blameworthy, and how much punishment they felt the agent deserved, before filling the HEXACO questionnaire. Our results point to a moderate role of honesty-humility, emotionality, and conscientiousness on acceptability of the agent’s behavior, with their relative weight depending upon the type of moral transgression. While higher honesty-humility scores were associated with lower acceptability of moral transgressions overall, higher emotionality was associated with reduced acceptability when the agent attempted to harm, and higher conscientiousness was associated with lower acceptability ratings only when the agent harmed intentionally. We also found a moderate effect of extraversion and emotionality on decisions of punishment and blame of an agent who harmed or attempted to harm. The results suggest that third-party moral judgment is modestly, yet selectively modulated by personality traits and the type of moral transgression.