Of course it doesn't...
In 2 Samuel 12:11-12, Nathan is clearly recounting
God's mercy in pronouncing judgment upon his servant David
much less than what his transgressions required according to the law (Ezr 9:13).
The judgment for Adultery required the blood of both the adulterer and the adulteress (Lev 20:10).
The judgment for Murder required the blood of the murderer (Num 35:31)
But in 2 Samuel 12:7-8, Nathan is clearly recounting
blessings received according to the Will of God through his father's Abraham, Isaac and Jacob (Gen 49:8-10).
These things were all blessings according to the anointing David received as the chosen servant of God:
"Thus saith the LORD God of Israel, I anointed thee king over Israel, and I delivered thee out of the hand of Saul;
And I gave thee thy master's house, and thy master's wives into thy bosom, and gave thee the house of Israel and of Judah; and if that had been too little, I would moreover have given unto thee such and such things."
These things were the result of God's righteous judgment for David doing evil in God's sight, for despising God's commandments, for despising his neighbor and his neighbor's wife:
"The sword shall never depart from thine house; because thou hast despised me, and hast taken the wife of Uriah the Hittite to be thy wife. Thus saith the LORD, Behold, I will raise up evil against thee out of thine own house, and I will take thy wives before thine eyes, and give them unto thy neighbor, and he shall lie with thy wives in the sight of this sun. For thou didst it secretly: but I will do this thing before all Israel, and before the sun."
Surely I shouldn't have to say that this does not mean God approves of adultery. Right?
And then when David's sins are clearly recognized, he humbles himself, acknowledges his sin and repents.
2Sa 12:13-14
(13) And David said unto Nathan,
I have sinned against the LORD. And Nathan said unto David, The LORD also hath put away your sin; you shall not die.
(14) Howbeit,
because by this deed you have given great occasion to the enemies of the LORD to blaspheme,
the child also that is born unto you shall surely die.
But in due time, when David will be raised up from the grave (Act 2:29) he will be able to say clearly and with excellent knowledge whether he sinned in taking more than one wife. If he agrees with what God has recorded in the scriptures for our learning (2Ti 3:16) we can anticipate what his answer might be:
1Ki 15:5 Because
David did that which was right in the eyes of the LORD, and turned not aside from any thing that he commanded him all the days of his life,
save only in the matter of Uriah the Hittite.
Don't forget that David's first wife Michal was made barren all of her days because she despised the King in her heart. So then,
how was Jesus then to become the son of David?
In that day before God, I don't want to be on the side of unrighteous judgment before David's Lord.So I practice this verse today while I have my being;
for live is a vapor and all flesh is grass.
Rom 3:3-4
(3) For what if some did not believe? shall their unbelief make the faith of God without effect?
(4) God forbid: yea,
let God be true, but every man a liar; as it is written, That you might be justified in your sayings, and might overcome when you art judged.
And even still, I am not an advocate for Polygamy; and neither am I an advocate for a man to multiply wives unto himself.