On most questions where a majority with authority is facing a minority of dissenters or skeptics, the majority is delusional.
IOW, you are living in the Matrix; much of what you and people believe is fundamentlaly wrong.
Reason 1 is that the majority forms its view by circular reasoning, and rejects any attempt at logical discussion without considering it seriously, so it is prone to delusion.
Reason 2 is a minority wouldn’t be holding out without a good reason, because they are punished for their opposition with scorn and hatred at least. The usual reason they are so stubborn is they are defending rational truth.
Reason 3 is there’s often big money to be made or political power to be gained by influencing the majority opinion. Rationality doesn’t have a press agent, and there’s no money in swaying the minority position.