Dear Chaim,
I admire and respect you greatly, but I would like to take issue with your defence of polygamy. Sorry for the long comment.
1) No sane and self-respecting woman would think that sharing a husband with another woman is justice. It is a great injustice and offence to a woman's dignity. Try to imagine yourself sharing a wife with other men, and you would know how a woman would feel. Women have the same feelings as men.
2) Given that there is about an equal number of men and women, introducing polygamy would leave many men without a wife, which is an injustice to men, as well. Polygamy would not increase the population, because you would lose the potential children of the men who are now left without mates.
3) I am not aware of any Torah commandment that orders polygamy (am I wrong?), so the Jewish state without polygamy would not break G-s' laws.
4) The fact that the Patriarchs had several wives is not a sufficient reason, in my opinion, to re-introduce the practice. You yourself said that our illustrious ancestors, great as they were, were not automatically blameless in everthing they did. Even they erred occasionally. There might have been historical reasons back then which made polygamy defensible. I don't see such reasons today.
Chaim, even if you poll the opinions of very conservative women who believe in traditional values, including those who write to this forum, you will see that they are strongly against polygamy. Women don't want the return of polygamy. You can force it by law, but I doubt that you will be able to come up with an argument that will make it attractive to women. Why advocate a parctice that is not mandated by the Torah and will alienate half of the population? If you continue to support it, I hope you will do some soul-seraching and convince yourself that polygamy is consistent with the spirit of righteousness, justice, and equal respect for human dignity that permeates our Great Book.