At least we laid it out there for those who want to investigate. I hope they will find truth by research and honest appraisal and not just a burning in the bosom.
Regarding D&C; check out the heading of section 132 in the 1981, or later publication (my recollection had the changes occuring in the late 1970's):
Revelation given through Joseph Smith the Prophet, at Nauvoo, Illinois, recorded July 12, 1843, relating to the new and everlasting covenant, including the eternity of the marriage covenant, as also plurality of wives. HC 5: 501-507. Although the revelation was recorded in 1843, it is evident from the historical records that the doctrines and principles nvolved in this revelation had been known by the Prophet since 1831.
A committee appointed by the First Presidency of the Church directed the publication of a new edition of the Doctrine and Covenants in 1981. New features included completely revised footnotes and rewritten introductory headings for each section. Two additional sections and a second official declaration were also incorporated. Section 137 is a portion of a vision of the Celestial Kingdom given to Joseph Smith in the Kirtland Temple on January 21, 1836. Section 138 is a vision about the redemption of the dead given to Joseph F. Smith, sixth President of the Church, in 1918. Official Declaration-2 is the 1978 announcement by the First Presidency that all worthy male members of the Church can be ordained to the priesthood.
I don't understand why this information was so difficult for you to find.
Emma, Joseph's wife, had been suspecting Joseph of having affairs with other women, i.e., Fanny Alger about 1831 and from then on. Family life was not very happy and calm. Joseph was relating this to his brother Hyrum and William Clayton. Hyrum suggested that Joseph would write a "revelation" where God gives instructions for Joseph to have other wives. Joseph doubted Emma would believe that. However, William Clayton wrote it down and Hyrum took it to Emma. EMMA DID NOT BELIEVE IT.
Later on, Joseph somehow convinced Emma to accept it, which she did for a short time, but after Joseph's death, Emma went into a total denial of polygamy as if it had never happened. Many thought that her reasons were to protect her children and their memory of their father.
Utah LDS Church's historian, Andrew Jensen, in 1887, taking from the enormous files of then secret manuscript material in the Salt Lake City Church Library, compiled the first list of 27 wives of Joseph Smith. Genealogical Archives were used to add another 21. Nauvoo Temple records were the main source. Fanny Alger was his first plural wife, married to Joseph in 1834.
If one looks at the D&C from 1890, it says that revelation was GIVEN July 12, 1843. "History of the Church," vol. 5. pages 500-501, also says that it was GIVEN that day, but now D&C section 132 says that it was RECORDED July 12, 1843 - implying that it could have been given at an earlier date. This kind of altering of the records of the Church can be noticed quite often by comparing the earlier printings with the more recent ones.
Obvious attempts were thus made to save some integrity, since Joseph Smith had made a number of public denials of even knowing anything about polygamy. He and the Church leaders denied it publicly, but practiced it secretly. In the first edition of the Doctrine and Covenants, printed in 1835, in Section 101:4, there is denial of polygamy, calling it a "crime of fornication..." This remained in the D&C until 1876, when it was removed, and Section 132 added about God commanding the practice of polygamy. Examples of the Church practicing unwritten, undocumented dogma........there are many, many others.