[nvlled]

Ever heard of tribalism and echo chambers? Wrongness being a function of number of dissidents is a terrible heuristic, in contrast to determining the lies and falsehood based on the soundness of the argument or logic.

Also, when a population group is large enough (e.g. entire world), it's quite likely a crazily-held belief is shared by other people, or people who would at least nod in agreement.