The Vaccination Divide: Exploring Moral Reasoning Associated with Intergroup Antipathy Between Vaccinated and Unvaccinated People.

OBJECTIVES:There is growing evidence of intergroup hostility between vaccinated and unvaccinated individuals, a process of polarization that threatens to derail population health efforts. This study explores the moral underpinnings of intergroup antipathy between vaccinated and unvaccinated individuals.DESIGN:A cross-sectional design was employed to investigate the associations between the view of vaccination as a social contract or individual choice, perceived vulnerability to disease, perceptions of outgroup morality, feelings of warmth, and experiences of schadenfreude.METHODS:Data were extracted from an online, quantitative survey of 233 vaccinated and 237 unvaccinated participants collected between June and July 2022.RESULTS:Results revealed that vaccinated people had stronger negative attitudes towards unvaccinated people than vice versa. In line with hypotheses, the extent to which vaccinated people saw vaccination as a social contract was significantly associated with perceiving unvaccinated people as immoral. For unvaccinated people, seeing vaccination as an individual choice (the opposite of a social contract) was significantly associated with perceiving vaccinated people as immoral. Among both groups, viewing the other as immoral was associated with feeling significantly less warmth towards the opposing vaccination group, and more schadenfreude in the face of an outgroup member's suffering. Participants' perceived vulnerability to disease played a relatively small role in explaining polarization between vaccinated and unvaccinated people.CONCLUSIONS:This research builds on previous studies by identifying moral mechanisms associated with intergroup antipathy in the vaccine debate.