Polygamist denials of wrongdoing are hollow.
Joseph Smith denied it when confronted, while having numerous wives at the time.
John Taylor, another president, denied doing it while continuing the practice.
Wilford Woodruff officially discontinued the practice in order for Utah to join the union, but kept his harem intact.
The original section 101 of Doctrine & Covenants denied doing it and protested the wrong of polygamy; it was removed and replaced with section 132.
Joseph Smith started the practice of marrying underage girls, and his true disciples continue it today.
52 And let mine handmaid, Emma Smith, areceive all those that have been given unto my servant Joseph, and who are virtuous and pure before me; and those who are not pure, and have said they were pure, shall be destroyed, saith the Lord God.
53 For I am the Lord thy God, and ye shall obey my voice; and I give unto my servant Joseph that he shall be made ruler over many things; for he hath been afaithful over a few things, and from henceforth I will strengthen him.
54 And I command mine handmaid, Emma Smith, to abide and acleave unto my servant Joseph, and to none else. But if she will not abide this commandment she shall be bdestroyed, saith the Lord; for I am the Lord thy God, and will destroy her if she abide not in my law.
55 But if she will not abide this commandment, then shall my servant Joseph do all things for her, even as he hath said; and I will bless him and multiply him and give unto him an ahundredfold in this world, of fathers and mothers, brothers and sisters, houses and lands, wives and children, and crowns of beternal lives in the eternal worlds.
56 And again, verily I say, let mine handmaid aforgive my servant Joseph his trespasses; and then shall she be forgiven her trespasses, wherein she has trespassed against me; and I, the Lord thy God, will bless her, and multiply her, and make her heart to brejoice.
From the article: "The groups advocate and practice polygamy as it was taught by early leaders of the Mormon Church"
I note that these polygamist cults emphasize the connection to the early mormon church.
The present day leaders have spent millions on trying to hide and whitewash most of the teachings of the early mormon church....I don't think their success rate will go up with the Jeffs trial...and I suspect there were soon be trials of the accomplices to the rapes.