First, As you study history you will finding in the collapse of ALL civilizations, a decline in morality. Civilization gives way to barbarity. It is almost a form of societal “entropy”. This not an opinion based upon a perspective. That which was virtuous and moral is replaced by depravity and immorality.

Second. Think about your statement…”While you and I may not agree that it is neither desirable nor productive, is it our place to discriminate against people who desire it?” Should we now not speak out against incest, child rape, beastiality, etc., because we are “discriminating” against that behavior? Thomas Jefferson said, “The purpose of government is to preserve good”. If it is counter productive or destructive to an individual or the society, then of course, which choose to preserve the virtues of civilized behavior. Second the lack of religion …or the abuse of religion adds in the decline of a society. Your statement is non-sequetor and based on religious bigotry. The fall of Rome was the influx of barbarism and lead poisoning. Christianity actually saved the empire by restoring a central leadership and law. I recommend “The Fall of the Roman Empire: A New History of Rome and the Barbarians”, by Peter Heather. Also it was a moral shift that brought the end to racial slavery in the United States but that "shift" was a return to the moral high ground of the Christian faith. See the writings of great Christian abolishionists like: Charles Finney, Lyman Beecher, Harriet Beecher Stowe and William Lloyd Garrison.

Your comment on Abortion is also without merit. How have you determined a child in the womb has “no soul”? The only difference between a child in the womb and outside the womb is the way they breath and eat. Are we now going to execute everyone on breathing apparatus and IV? Christianities stance upon the sanctity of life and protection of the most helpless in our society is both courageous and appropriate. You cannot determine the rightness or wrongness of an issue by the application of historical extremes.