Honestly
@Bartato, I read the first half of your message post and absolutely loved it - you're saying things that I really wish more men would realise. You've just taken it too far towards the end.
I do think that this is a very real problem for many men. They discover polygamy is permissible, and leap from that into pursuing it, hunting for another wife or more under their own strength, regardless of the harm to their existing wife and others in their lives. This can most certainly be an idol - and it's an attractive one, because it involves sex. Idolatry has always been associated with sex - that's why pagan worship involved prostitutes. This is a weakness Satan is very good at exploiting, to turn men away from God and towards their own desires.
But monogamy can be an idol in the same way. How many men pursue woman after woman and get themselves into lots of trouble, without ever once being polygamous? Obviously, far, far more. Most people are susceptible to Satan's wiles and can be easily dragged into a life of lust.
But there are a few men who are really focussed on God. They know this is wrong. They genuinely want to follow Him. They're far harder for Satan to target with loose women - they won't fall for it. He has to be far more cunning - and polygamy can give him the opening he is looking for, to take this desire for lots of sex with different women, which the Godly man resists, and give it a veneer of holiness, allowing him to capture this man in the same net.
Satan is a cunning devil, and both monogamy and polygamy are tools he twists to his own ends. That does not, however, mean that either are inherently idolatrous - just that either can be made into idols.
This may or may not be true. An argument can be made in either direction. I don't think it's a profitable topic to argue over - regardless of whether polygamy was God's original plan or whether it was a result of the fall, we live in a post-fall world and polygamy exists. If polygamy was permitted by God as a result of the fall - then he permitted it
because he needed to, because it was necessary in some situations to deal with the results of the fall.
In other words, this would mean it is even more necessary in our world today than if it was the original plan! God's original plan was for a pre-fall, perfect world. And we don't live in such a world.
God's original, ideal plan was for no widows to ever remarry (with no death, there would be no widows), and for no child to ever be adopted (with no death, there would be no orphans). Remarriage and adoption are consequences of the fall. Does that mean that a widow should remain single, and not remarry, because remarriage was not in God's original plan? Does it mean orphans should be abandoned and expected to fend for themselves? Of course not. In the real world of today, death occurs, leaving widows and orphans, and God has given us ways of dealing with them. Far from being told not to do either of these, remarriage and care of orphans is positively encouraged, even mandated in some circumstances.
So even if we assume that God's original plan for a perfect world was monogamy - that is not relevant to today. And if we religiously try to follow an obsolete plan, we may fail to see God's plan for our lives today. We must recognise God's plan for the world today - a fallen, broken world - and be God's lights in that broken world, His hands to heal that world.
We cannot abandon orphans because they didn't exist pre-fall. Nor can we abandon widows because they didn't exist pre-fall.
Should we abandon excess single women, who cannot marry because of the demographics of a fallen world, just because they too did not exist pre-fall?