Same-sex marriage is not an idea that emerged from a vacuum. The project of normalizing homosexuality has deep roots and ideological momentum. 

Why does same-sex marriage make sense to so many people? The momentum toward the full legalization of same-sex marriage seems to intensify with every passing month — or even faster. The moral divide in this nation is now seen most clearly in the distance between those for whom marriage is exclusively heterosexual and thus a settled issue and, on the other hand, those who honestly see the legalization of same-sex marriage as a moral mandate required by justice.

Given the venerable status of marriage and its universally established heterosexual character — at least until very recently — the burden of argument falls on the need to explain how such a movement for a moral revolution gained credibility, cultural mass, and momentum. How did this happen?

A culture does not consist only of ideas and ideologies, but no culture exists without them. Given the complexity of any culture, a comprehensive map of these ideas, moral intuitions, and philosophies is impossible to create. Nevertheless, some patterns are clear enough. We can trace the acceptance of same-sex marriage to at least three major ideas that have been shaping the modern mind for some time — and are held to some extent by both social liberals and conservatives….

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