As for the broader Mormon narrative arising from this, a number of Lds leaders propagated such nasty teachings...the three worst in history being:
(a) Brigham Young
(b) 10th Lds "prophet" Joseph Fielding Smith, grand nephew of Joseph Smith
(c) And Lds "apostle" Mark E. Petersen -- who died exactly 30 years ago as of tomorrow...Mark E. Petersen
If you want to see how one of the key theological traces of why Mormons sought to ban blacks from so many aspects of their faith played out through the years, just do a Google search on the word "valiant" (and add the LDS acronym).
Even a year after the supposed doctrinal "change" (1979...the so-called "change" took place in 1978), we find this interesting paragraph in the back of the Mormon-published Bible (source LDS Bible Dictionary, p. 788 in back of Holy Bible published by Lds church, 1979)...of which I have a copy:
"Although one-third of the spirits became devils, the remaining two-thirds were not all equally valiant, there being every degree of devotion to Christ and the Father among them. The most diligent were chosen to be rulers in the kingdom (Abr. 3:22-23). The nature of the conflict, however, is such that there could be no neutrals, then or now (Matt. 12:30; 1 Ne. 14:10; Alma 5:38-40)."
You see...Mormon theologians divided this conflict in heaven into at least three sides:
* 1/3rd became demonic spirits;
* Of the remaining 2/3rds, the most faithful spirits became "good Mormons" on earth...some also then went on to become angels after being people who lived on earth;
* The other group were so-called "neutrals"...And the Mormon narrative went -- that God cursed these neutral spirits with black skin for their lack of pre-existent "valor"
So, not only was all this above used to unfairly and prejudicially categorize entire races of people, but it also actually became a base for prideful elitism among Lds general authorities. Why, they concluded, by very virtue of their leadership, they proclaimed how "valiant" their spirits must have been in the premortal life!
Pride fosters and feeds upon more pride!
Pride and Prejudice can sum up the entire foundation of the Mormon religion!