Ideally, one would have a meta cognitive toolkit and regularly retest their beliefs, sincerely. But that's unfortunately advanced technique, and likely requires the better part of a decade of reading and practicing.

What helps most is probably having more antibodies "in the water supply". If we spread concepts like this widely, they'll help once they're common ground for enough people. And I think it helps a lot that PG didn't give examples in his essay. Giving examples would immediately get him coded as x-ist, and color the article as political. And politics is the mind killer...