I don't think TKAM doesn't focus on unpleasant themes - it overlaps in many places with topics Morrison would cover. I do, however, think that Beloved is much more graphic than TKAM. The point I guess I was trying to make is that books that make people confront the cruelty of humanity in the past in such a visceral way are sometimes avoided for that reason. I also don't mean to say that everyone should have read this specific book because I like it, I more mean that I was surprised it may not be taught as much. But, to your point, there are reasons for that.