DLB writes: "How subtle is it really to read a story and see where polygamy gets those who practice it consistently into trouble? "

This seems a bit vague. Is there any Scriptural evidence to support the notion that any misfortune visited upon the polygamous prophets was indeed a manifestation of punishment from God? Many other prophets and patriarchs suffered misfortune, often as a result of actually being righteous and doing God's will. How does having "trouble" indicate God's displeasure necessarily?

Also, is there any evidence that the polygamous patriarchs repented of their practice of polygamy? Sure, David repented of adultery, but that's the theft of the wife of another. I'm not aware of any similar repentance on the part of Abraham for his three wives or of "wise" Solomon for his hundreds, although there might be. (?)

My point is: you believe polygamy to be a sin. Nevertheless, God used unrepentant, polygamous men to establish the Judaic culture and religion: far from being condemned, these men were upheld as models of faith, and there is no indication that their salvation was ever called into question.

I can't see why the same can't be said for the faithful homosexual.

This is the "spirit of Scripture" I think the Newsweek author is alluding to.