God set the standard from the beginning, He created one man and one woman to be one. He created Adam and Eve, not Adam and Eve, and Tammy, and Betty, and Susan,...etc.<quoted text>
He also gave laws on what to do if someone steals, commits adultry, or murders.
Just because Moses or God or his Prophets give laws on how to deal with the consequences of mans sins does not me they are condoned or to be practiced.
Again God's commands forbid Polygamy not once does he command this God or his prophets no he in fact calls us to be of one wife and Especially Elders leaders of the church if the are not of one wife the NT commands us God commands to allow them in leadership positions.
That is why LDS is FALSE they do and did.
People are to become one flesh, not one dozen.