He did find favor in God’s eyes. As did David, who committed adultery and murder, and so forth. God forgave their sin. He did not condone it.
The Bible shows us the fruit of multiple marriage and describes in savage detail the devastation it brings.
Solomon was lost due to his many wives, who turned his heart from the LORD.
The agonizing fighting between rival women, for example Samuel’s mother and her “sister-wife,” is detailed.
The antagonism between the sons of Jacob, to the point of the favorite of his favorite wife being nearly murdered, then sold into slavery (Joseph) due to the intense jealousy polygamy creates, is shown.
The rivalry between Jacob and Esau is STILL causing WARS in which millions at this point have been KILLED.
God created Adam and Eve. He gave Adam ONE wife. So it is and so it ever should be. That is normative; that is right; that is God’s intention and design.
Excuse me, but Jacob and Esau were TWINS, their rivalry has nothing to do with polygamy. You probably meant Isaac and Ishmael, and how Abraham's sin is still causing untold problems today. Other than this, you made an excellent point!
David was the far better example of showing polygamy for what it is. The fact is, that there are plenty of bad temptations that come with being polygamous, and plenty of responsibility involved in it. For that reason, there’s plenty of reasons why, for the sake of common law, we shouldn’t have a need to sanction something that is an exception, and has plenty of potential for corruption at the same time.