Leftist postmodernists are damn good at critiquing things, and calling out why one should reject a mainstream position.
Of course, they forgot that the seductive belief in rationalism - specifically in the claim that some human recognize reality more correctly than others (and education is what separates the wrong from the correct) - is most likely the beginning of every from of hierarchy and oppression that they critique.
Why is it that Foucault - an author who writes all about how shitty schools are - is required reading in many undergraduate classes? If he saw people being graded for regurgitating his ideas, he'd be spinning in his grave!
The Academy is where critical theory goes to be neutered. And it must be, as it would be too subversive without tenured academics to keep the proles from direct action.