Abstract

Vaccine hesitancy persists despite vaccination’s important role in global health. As many vaccines provide social benefits through herd immunity, vaccination decisions can raise moral concerns. Two studies explored the role of moral convictions in vaccination decisions. Study 1 (N = 485) revealed higher vaccination intentions when individuals thought about vaccination in moral terms. Emotions and moral piggybacking positively predicted moral convictions. In Study 2 (N = 1,111), we evaluated the effects of emotional, moral, and scientific pro-vaccination arguments on moral convictions, support for mandatory vaccination, and tolerance of dissenting views. While no group differences were observed, moral convictions were correlated with increased support for mandatory vaccination but also with a reduced tolerance of dissenting opinions. Overall, moral convictions play a small but significant role in vaccination-related decisions. While moral convictions have beneficial effects on compliance, it is crucial not to overlook the adverse consequences, which may lead to a growing societal divide.