Between Law and Conscience: Act Legality Shapes Moral Evaluation

Can legality shape moral judgment? Across four experiments (N = 1,559), participants judged identical actions as more morally wrong when they were described as illegal rather than “not illegal.” This effect extended to judgments of moral character: individuals who performed illegal actions were evaluated more negatively than those who performed otherwise identical legal actions. The influence of legality was robust across several contexts, emerging even when agents violated the law unintentionally, when laws were imposed by a totalitarian government, and when actions were described as socially accepted by the majority of local residents. At the same time, legality exerted a stronger influence when it aligned with prevailing social norms and among participants who more strongly endorsed respect for authority as a moral good. We propose that people commonly use legality as a heuristic cue when evaluating the morality of actions and actors. Together, these findings suggest that legal frameworks not only reflect public opinion but also shape how people judge the morality of actions and those who perform them.