Mitt is old enough to have believed that blacks were not fit for full membership in the church.
https://www.google.com/search?client=firefox-b-1-d&q=mormons+black+people+souls
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https://religionnews.com/2018/06/11/40-years-later-most-mormons-still-believe-the-racist-priesthood-temple-ban-was-gods-will/
Blacks just werent spiritually ready to have the priesthood until 1978.
This one hit the news as recently as 2012, when a BYU professor was quoted in the Washington Post as claiming that the ban was actually to the benefit of blacks, because they were not prepared for the responsibility until then. He compared the situation to a child asking for car keys before being mature enough to use them. That same month, the LDS Church issued a statement that disavowed this professors reasoning. (Some explanations with respect to this matter were made in the absence of direct revelation and references to these explanations are sometimes cited in publications. These previous personal statements do not represent Church doctrine.) But that same statement also leaned heavily upon Reason #4, which was . . .