DeepShadow
White Crow
Another possibility is that the racism expressed in the book is, like all racisms throughout history, not total, or not totally consistent/coherent. Racism is not an all-or-nothing phenomenon.
I would agree, bearing in mind that I believe the book's racism is coming from narrators, not from a single author. That is, the narrators WORDS are racist, but the overarching STORY is actually quite egalitarian. If anything, the story is about racist Nephites learning what's really important.