It's probably because Mormon families produce lots of (white) children and gay marriage does not.
International law makes mention of "lack of equality", which is kind of a clue.
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In 2000, the United Nations Human Rights Committee reported that polygamy violates the International Covenant on Civil and Political Rights (ICCPR), citing concerns that the lack of "equality of treatment with regard to the right to marry" meant that polygamy, restricted to polygyny in practice, violates the dignity of women and should be outlawed.[120] Specifically, the reports to UN Committees have noted violations of the ICCPR due to these inequalities[121] and reports to the General Assembly of the UN have recommended it be outlawed. [122][123] Many Muslim states are not signatories of the International Covenant on Civil and Political Rights (ICCPR), including Saudi Arabia, United Arab Emirates, Qatar, Malaysia, Brunei, Oman, and South Sudan; therefore the UN treaty doesn't apply to these countries.[124]
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