That is a mystery to me. Because the same God who gave Adam one wife gave to King David and King Joash multiple wives:
Well it seems to me that if you want to talk about the nature of men, you have to look to the creation account. If God created men to have multiple wives (i.e. put it in their nature), surely He would have provided multiple wives to Adam. IOW, IMO, Genesis trumps Chronicles.
Remember that David and Josiah were both products of the post-fallen societies.
God allowed a lot of things under the Old Covenant that weren't His ideal. He operated within the culture a lot of the time, although it often went against His ultimate design.
God didn't even desire for the Israelites to have a king in the first place, He caved to their demands.
2 Chronicles 24:2-4
Again in 2 Chronicles we have the great King Joash who restores the temple of God. The high priest Jehoiada who was the voice of God to the King brought him two wives. If this was a violation of God's design why would he have his high priest bring Joash two wives?
God does not discourage monogamy, but he also does not limit marriage to monogamy. God gave Adam one wife, he gave David the wive(s) of Saul, and he gave Joash two wives through his high priest.
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There is no indication in that passage that Jehoiada was acting on God's instructions.
With regard to David.... I can see how you can take that at literal face value and say that God said He gave all those wives to David. I read it a little more figuratively. I think the point God was making is that David had more wives than he needed already and he still went ahead and murdered a man to get another. In the sense that God gave David the kingdom, God could be credited with giving him all that went along with it. The Israelites followed the worldly pattern of kings with lots of wives to ensure an heir. Wives were thought of as property and ways to make alliances with other kings and powerful people. It seems to me that the lesson to be learned from that story isn't "God thinks it's okay to have multiple wives" but "keep your hands off of other men's wives."
Having multiple wives never seemed to bring any of those men happiness or anything good. Abraham ended up having to send Hagar away. Jacob's wives went behind his back to work out deals as to which would be with him and his sons were at odds with one another due in part to having different mothers. David faced grief because of Michal and Bathsheba and his children suffered ill consequences as a result, too (with his sons being at odds with one another, one son raping David's daughter, etc). The Bible says that Solomon's wives led him away from God and the so-called wisest man who ever lived ended his life worshiping false gods.
There are two times in the Bible when God played matchmaker. The first is Adam and Eve when He created the first couple (not group, lol). The second is Isaac and Rebekah. And Isaac had only Rebekah for a wife.
It seems to me that when God is
really directing things, His plan is for a man to have one wife. Yes, He has allowed polygyny, even gone along with the culture in which it was practiced. But He also had rules about slavery even though through Jesus we have learned that God's heart is for all mankind to be equals.