Only Certain Groups Can Say Certain Words

This author says, not so fast:

Is it acceptable for pedagogical purposes to enunciate the epithet “[N-word]”?...

I am an African American, born in 1954 in the Deep South (Columbia, S.C.). My parents of blessed memory were refugees who fled Jim Crow oppression. They were branded as “[N-word].” And I have been called “[N-word]” too. 

Should my race make a difference, cloaking me with more leeway in my pedagogical options than white colleagues? I abjure such a “privilege.” In the domain of culture there ought be no boundaries that fence out people based on racial identification or ascription. There ought be no words that Blacks are permitted to say but that whites or others are prohibited from saying. While racist use of “[N-word]” should be condemned no matter the racial identity of the speaker, nonracist deployment of “[N-word]” should be accepted no matter the racial identity of the speaker. ... 

Racism, alas, remains a powerful presence that displays itself ubiquitously, as in the deeply disturbing campaign to intimidate dissident instruction about the history of American racial wrongs. Racism is a looming, destructive force that we must vigorously resist. Vigilance is essential. But so, too, is a capacity and willingness to draw crucial distinctions. There is a world of difference that separates the racist use of “[N-word]” from the vocalizing of “[N-word]” for pedagogical reasons aimed at enabling students to attain important knowledge.

Some words we don't use in public merely because they're base and vulgar, with synonyms a-plenty for substitution.  In certain instances, though, they can be appropriate.  So it is with some slurs.  

Let's be honest, there's some quality literature out there that can't be read without racial slurs, and that includes more than just Mark Twain, Harper Lee, and James Baldwin.  The article above insists on an academic use of certain terms that otherwise wouldn't be appropriate.