hence the "us vs them" false dichotomy that so many of them like to indulge in

maybe not such a false dichotomy....the people who see reality V's those that don't/can't?...scary... (irrelevant of IQ)
It's easier to induce delusion ( a carrot - to offer a reality - and one that's already desired in the head of those being 'attacked'..)

_ ...and is there a difference between midwits and the merely above-average_.

Yes.
Not all people within 'the IQ range' are midwits ...

• But all midwits are within the IQ range...