This study investigated whether recipients' past moral or immoral behaviour shapes 4-year-olds' judgements of the agents who either harm or help the recipients. Children (N = 161) watched the agent who either harmed or helped the antisocial, prosocial, or neutral recipient. Afterwards, children indicated their sociomoral judgement of the agent's act, their attitude towards the agent and their perception of the agent's emotions. Children liked the agent more, ascribed less sadness to the agent, and judged the agent's actions as less bad when the agent inflicted harm against the antisocial recipient than on the prosocial and neutral recipient. The recipient's past behaviour did not influence children's evaluations when the agent helped the recipient. The presented evidence indicates that by the age of 4, children develop the ability to use complex moral reasoning that allows them to monitor whether the harmful behaviour of antisocial others is justified by retaliation for past transgressions.

Young children display strong aversion toward antisocial individuals, but also feel responsible for joint activities and express a strong sense of group loyalty. This paper aims to understand how beneficial cooperation with an antisocial partner shapes preschoolers’ attitudes, preferences, and moral judgments concerning antisocial individuals. We argue that although young children display a strong aversion to antisocial characters, children may overcome this aversion when they stand to personally benefit. In Study 1a (N = 62), beneficial cooperation with an antisocial partner resulted in the children's later preference for the antisocial partner over the neutral partner. Study 1b (N = 91) replicated this effect with discrete measurement of liking (resource distribution) and showed that children rewarded more and punished less the antisocial partner in the beneficial cooperation setting. In Study 2, (N = 58), children's aversion to an antisocial in‐group member decreased when the cooperation benefited other in‐group members. Finally, in Study 3 (N = 62), when children passively observed the antisocial individual, personal benefits from the antisocial behavior did not change their negative attitude toward the antisocial individual. Overall, beneficial cooperation with the antisocial partner increased the children's liking and preference for the antisocial partner, but did not affect the children's moral judgments. Presented evidence suggests that by the age of 4, children develop a strong obligation to collaborate with partners who help them to acquire resources—even when these partners harm third parties, which children recognize as immoral.

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