willful ignorance is a facet of the complex of tendencies you find with psychopathology in its various forms and degrees

people who are willfully ignorant have a covert and very much willful agenda as well - which may just be seeking approval from a more powerful psychopath

i have a simple rule about how to deal with these kinds of people

don't.

avoid them and once you identify them, shun them and make it clear to your friends how and why you do so

the thing that makes them behave themselves most effectively is being ignored, it is not just bible stories, the root of psychopathy is literally self image, aka pride