There is no deficit. Their neocortexes haven't died, and they are not insane.
Just like the "intelligent" physicist concocts a theory, and then proves himself completely wrong with an experiment, an "intelligent" man concocts a social conspiracy theory, but nothing proves him wrong: instead, he pronounces those who "don't get it" hopelesly stupid, too socially dumb to participate in a society.
Just like the "intelligent" physicist concocts a theory, and then proves himself completely wrong with an experiment, an "intelligent" man concocts a social conspiracy theory, but nothing proves him wrong: instead, he pronounces those who "don't get it" hopelesly stupid, too socially dumb to participate in a society.