The author describes "believing" in "Good Old School Chicago Economics" by analogy to religious faith. He then says that most learners balk at being told they are made in the image of "homo economicus" (our Lord and Saviour). He is cruel! He is nothing like me, or my family!
If learners can't accept the orthodoxy, if it causes them cognitive dissonance, then where does the problem lie? Is it within the student -- unable to grasp the fundamental Truth revealed in the gospel of "Good Old School Chicago Economics"? Or are they (unconsciously?) rebelling against indoctrination into a death-cult which is worshipping the antisocial, careening towards an apocalypse, and telling them "There Is No Other Way".
I dunno, it's probably because undergrads are dumb.