The Bible simply states the information as a fact and never endorses or praises it. In fact, if we look at those in the Bible who had multiple wives, misfortune always came to them as a direct or indirect result of their polygamy. For example, Jacob’s sons, born from several different mothers, develop rivalries among themselves, resulting in the selling of their brother Joseph into slavery. David’s son’s, born from different wives, fight and kill among themselves for the throne after his death. Solomon’s many wives lead him away from God and into paganism in his later years, weakening the kingdom and leading to it’s breakup. The examples could be multiplied. I think the bad effects of polygamy in the Scriptures speak for themselves.