"And the Lord God said unto me: They (the Lamanites) shall be a scourge unto thy seed, to stir them up in remembrance of me; and inasmuch they will not remember me, and hearken unto my words, they shall scourge them even unto destruction."
-- II Nephi 5:25
In this verse from the book of Mormon, the purpose of people of color is fully displayed. The people of color are upon this earth to be a scourge.
From dictionary.com, the definition of scourge when it is used as a noun means "a person or thing that applies or administers punishment or severe criticism."
The Mormons really believe that people of color were placed upon the earth to torture and to destroy Caucasians. If that's the case, then the Egyptian Empire would have lasted forever.