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Prejudiced attitudes and political nationalism vary widely around the world, but there has been little research on what predicts this variation. Here we examine the ecological and cultural factors underlying the worldwide distribution of prejudice. We suggest that cultures grow more prejudiced when they tighten cultural norms in response to destabilizing ecological threats. A set of seven archival analyses, surveys, and experiments (∑ N = 3,986,402) find that nations, American states, and pre-industrial societies with tighter cultural norms show the most prejudice based on skin color, religion, nationality, and sexuality, and that tightness predicts why prejudice is often highest in areas of the world with histories of ecological threat. People’s support for cultural tightness also mediates the link between perceived ecological threat and intentions to vote for nationalist politicians. Results replicate when controlling for economic development, inequality, conservatism, residential mobility, and shared cultural heritage. These findings offer a cultural evolutionary perspective on prejudice, with implications for immigration, intercultural conflict, and radicalization.

Concerns over unethical leader behavior persist in today's workplace. Although some employees continue to support their leaders after learning of their unethical actions, others do not. In this paper, we integrate social cognitive theory with social information processing theory to propose that the support employees give to leaders who act unethically hinges on their propensity to morally disengage.Specifically, we develop a conditional indirect effects model, wherein moral disengagement propensity mitigates the negative impact of unethical leader behavior on leader-directed support via employees' perceptions of value congruence with and trust in the leader. The sum result is an improved understanding of when and why employees offer support to versus withhold support from leaders who act in ethically questionable ways.

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