There’s also just plain distrust of government and media pushing something. Our trust in government and media is so low that when they say do something, most rational people are immediately suspicious.
This is what happens when people check in their common sense for political allegiances. I have no doubt that if Trump had won, we would still be having this issue of the distrustful unvaccinated, but their politics would be more on the democrats side.
https://www.gov.ca.gov/2020/10/27/western-states-join-califo...
Independent review may have convinced some who were hesitant but I suspect they would have been the folks independently hesitant as opposed to the “politically hesitant”. The politically hesitant would hold out until their trusted party authorities blessed the vaccines.