One of the messages that I keep finding in the Book of Mormon has to do with how we view one another culturally, and what the roles are of different peoples in the world then and now.
I just read Jacob 3, which includes a stern warning towards the Nephites regarding how they treated or viewed the Lamanites. Jacob was in charge at this point, Nephi having passed on, so they were only one generation away from the original conflict that separated the two peoples. In fact, it's possible that Laman and/or Lemuel were still alive; we don't know. Here's what the Lord says about the Lamanites to the Nephites: