Because Mormon polygamy is not simply a yesteryear concept for Mormons, no matter how much people convey it is.
What do Lds leaders still teach? From the source below:
* Marriage is celestial -- and eternal (D&C 132)
* That includes Past tense Lds polygamists -- like the g-g grandfather of Mitt Romney, Parley Pratt, who had a dozen wives...
* That includes present-tense serial polygamists ... Lds men (like Lds apostles Dallin Oaks, Tom Perry, and Russell Nelson...all men who have been "sealed" to a second woman "for eternity" as widowers...they believe both wives will be theirs in the afterlife)
* And Lds "apostle" Bruce McConkie's teaching that polygamy would return to earth when the Mormon Jesus returned... (Note: McConkie's book was re-published into the late 1970s)
I just posted an entire thread which highlights the info below: What is "Celestial Polygamy"? [Mainstream Mormons say polygamy still occurring near Kolobian colony]:
Excerpts from that...which I placed @ post #1 of that thread:
From the article: In a January 28, 1999 City Weekly article titled Only for Eternity, author Andrea Moore Emmett quoted LDS Church spokesman Dale Bills who said, We have to see sealing ordinances as a promise pending faithfulness and yes, some will live polygamy.
So...here, an Lds spokesperson -- forced to concede that Lds believes it is practicing polygamy on another planet/colony...
And not just another planet...as Lds "apostle" Bruce McConkie taught polygamy would return when Jesus returned:
From the article: According to an article in the April 20, 2008 edition of the Salt Lake Tribune: Though the LDS Church had disavowed polygamy, it is still enshrined in Mormon scripture (Doctrine & Covenants 132) and some believe it will one day be re-established, if not on Earth, at least in heaven. In his quasi-official 1966 book Mormon Doctrine, which remains in print, the late LDS Apostle Bruce R. McConkie wrote that the holy practice will commence again after the Second Coming and the ushering in of the millennium. And by policy, men can be sealed for eternity in LDS temple rites to more than one wife, though women are permitted only a single sealing. Three of the church's current apostles, for example, were widowed and remarried. Each will have two wives in the eternities (Modern-day Mormons disavow polygamy)...The three Mormon Apostles referred to in this article are Dallin Oaks, L. Tom Perry, and Russell M. Nelson. All three men are widowers, and all three men have been sealed to a second wife.
And so even three current Lds "apostles" (Oaks, Perry, Nelson) have been sealed "for eternity" in the Mormon temple...and anticipate sleeping with both wives in their "new life" beyond death...
From the article: Question: Is polygamy gone forever from the Church? We only know what the Lord has revealed through His prophets, that plural marriage has been stopped in the Church. Anything else is speculative and unwarranted. If it is really speculative and unwarranted, what is the point of Mormon widowers being sealed in Mormon temples? If temple sealings of this nature have significance in the hereafter, how can the LDS Church honestly say plural marriage has been stopped?
Here, the Mormon church again speaking out of both sides of its mouth...telling members one thing about so-called "eternal polygamy"...yet conveying a "Oh, it's all speculative" PR press release to the public!
So then, does that make Rick Santorum a Communist?