(=On the Bible and Polygamy=)
God also 'permitted' divorce and allowed Moses to issue certificates of divorce, but it wasn't His desire. He did it because of the sinfulness of man. I can't think for God, sin is sin and it matters not the generation. Besides all that, Jesus reaffirmed for the people the proper, godly, and right understanding of marriage, condemning the divorce certificate for nearly all reason (except unfaithfulness), and reaffirming that marriage is for one man and one woman only. This is how it was in the beginning, sinful people screwed up (as we do most things), God permitted it and even used it for his own advantage from time to time, but then reaffirmed it in Christ.