Humans are not rational creatures. Our beliefs can override rationality & that's true regardless of how smart you think you are. That's why you have Christian Scientists being convicted for child abuse/neglect for not providing a reasonable standard of medical care ("reasonable" being defined as "commonly accepted behaviors in our society"). Similar issues around beliefs would apply around vaccines, especially with extremely high levels of mistrust of the opposite party AND a historic amount of anti vaxxers generally. Would Democrats be accepting the vaccine so quickly if the bulk of the rollout happened under Trump? I don't know but I certainly had misgivings that the Trump government was playing politics fast-tracking the vaccine that evaporated when Biden came to power for some reason. I probably would have still taken the vaccine, but is that because I'm being rational or because I'm anti anti-vaxxers?