Conservatism, anti-vaccination attitudes, and intellectual humility: examining their associations through a social judgment theory framework

Previous research has consistently found that more political conservatism is related to higher anti-vaccination attitudes. However, little work has investigated how intellectual humility could potentially contribute to this relationship. Employing the social judgment theory of attitude change, we examined whether conservatism could mediate the association between intellectual humility and anti-vaccination attitudes. Participants (N = 1,293; 40.1% female; M_age = 38.23 years, SD_age = 11.61, range of age was 18–78) completed a multifaceted measure of intellectual humility, an assessment of four types of anti-vaccination attitudes, and a measure of political orientation. Results from structural equation modeling revealed that decreased levels of most aspects of intellectual humility (i.e., independence of intellect and ego, openness to revising one’s viewpoint, and lack of intellectual overconfidence) are associated with more conservative political views, which in turn is associated with stronger anti-vaccination attitudes, particularly worries about unforeseen future effects, concerns about commercial profiteering, and preference for natural immunity. These findings suggest that intellectual humility could reflect one’s latitude widths, thereby predicting their openness to vaccine massaging, and thus may play an important role in addressing anti-vaccination attitudes, especially when politics is involved.