If people find the submission intellectually gratifying then it conforms to the spirit of Hacker News submission guidelines. Given the impact of Harper Lee's writing on US culture, it is not surprising if many people do.
I hear that sentiment a lot. Personally I'm glad that we bring important cultural happenings and such in as topics of discussion. What is society if not the most complex project that we've ever feigned to attempt to grok on hacker news. These are the global variables that affect everything.