Granted, people like to pretend that the other side is a monolithic group of true believers who follow their side's "Messiah." But that is a fantasy employed to assist people to hate their political opponents.
Read up on First Past the Post voting systems, which is what we have for president. If given a material choice to vote for their favorite, a huge majority of the country would have voted for someone other than Biden or Trump. But, with our system, those votes for others would be wasted, and people are left with a choice of selecting the least evil option. Maybe 10% of the country really loves Biden or Trump. Maybe. So, we have, in effect, a minority rule country.