I think part of the reason these delusional theories are so readily accepted on the right is the influence of fundamentalist religion. People are more susceptible to such patently absurd claims when they are trained every Sunday to believe what they’re told without question or evidence. Trying to refute the theory by rational argument is an act of heresy, akin to arguing against Biblical truth. That’s why the adherents of these theories are so maddeningly impervious to logic, evidence, and reason: who needs logic, evidence, and reason when you have faith?