Also my apologises but it has been pointed out to me that the last two RLDS presidents have not been direct descendent of JS, but that the current heir apparent is once again related to the Smith family.

Incidentally are you aware that since a court case of 1924 the RLDS is legally the official continuation Smith’s church and that the Utah Church is a heretic schism founded by Brigham Young.
The prophets of the RLDS are direct descendent of Joseph and Emma Smith

Hope this make my point clear now.

Now to your quotes from the BOM.
Yes it was a commonly held belief, long before the Latter dayers began propagating it that the mark of Cain was was that he was turned black, ( though in light of modern genetic research it’s obvious that if there is any possible truth to the genesis myth, if Cain was changed in to anything it was a white man, since early hominids were all black anyway.)
Smith loved to write his fairy stories in the style of the old testament and borrowed from it wholesale.
All over the Bible are reference to people being ‘made white’ as an outward sign of inner purity it is nothing to do with race.
White = Purity is not racist, we still expect brides to wear white wedding dresses today and paint hospital and clinic rooms white to show they are sterile, pure and clean.

Remember the people we are talking about here are Semitic middle easterners, not white Europeans, colours of skin meant nothing to them. we know Simon of Cyrene was black, we know that from history and geography, so was the queen of Sheba, the bible does not even think it worth mentioning. To insult a man’s ethnicity was pointless to the Israelites, when you could insult his religion or his accent (recall Peter being mocked for his Galilean accent?)

Smith copied this reference to white purity and misinterpreted as a reference to skin colour, that’s not surprising, he got most of his Biblical interpretations wrong. However as a man of his times he was not as racist as many of his contemporaries and to give credit where credit is due was an anti-slaver. (he claimed the injustice and cruelty of slavery made his blood boil). However he probably believed racism was as inherent in ancient history as it was in his contemporary America.

So to return to my original point, quoting out of context to establish a point that is fundamentally untrue is not a good thing.
To prove the Mormon church as a whole is a racist institution is not difficult, Brigham Young alone would proudly supply you with thousands of unashamed pieces of hideous bigotry if you google for them, so why endanger your own credibility and reputation for accuracy by using a Smith quote from an anti-racist cometary out of context to make a false point?

Regarding Brigham Young, absolutely he made questionable things that Smith said into horrible things, however i would argue the things he said he first learned largely from Joseph Smith.

The book of Mormon says this 1 Nephi 11:13 And I beheld the city of Nazareth; and in the city of Nazareth I beheld a virgin, and she was exceedingly fair and white.

I assume you agree that the book of Mormon came from Joseph smith and not God, hence the quote above shows Smiths views on the superiority of white people. This goes on.

1 Nephi 12:23 And it came to pass that I beheld, after they had dwindled in unbelief they became a dark, and loathsome, and a filthy people, full of idleness and all manner of abominations

Alma 3:6 And the skins of the Lamanites were dark, according to the mark which was set upon their fathers, which was a curse upon them because of their transgression and their rebellion against their brethren, who consisted of Nephi, Jacob, and Joseph, and Sam, who were just and holy men.

and best of all

3 Nephi 2:15 And their curse was taken from them, and their skin became white like unto the Nephites.

I think that part has been changed now, however within Mormon doctrine from Joseph Smith, being white is pure and wholesome and being black is a curse that is a sign of rebellion, coming right from the pre-existence.