I am NOT advocating polygamy!
Polygamy is wrong, bad. Shouldn't be done.
I am being Scripturally precise.
Polygamy, like the replacement of the Saturday Sabbath with Sunday worship for Christians, is sacred Tradition.
It's not commanded by Scripture.
The abolition of polygamy, and the abolition of slavery on Christian principles, are but two examples of the way that, guided by the Holy Spirit, Christians have evolved a traditional morality that transcends the limits of Scripture and lives the concepts more fully than is strictly required by the Bible.
Polygamy was never tradition. It was man's perversion of God's plan. Please don't say God "allowed" it so it must be okay. God allows many things because of free will.