The fundamental core of the American societal experiment was a separation from an overbearing authority in the pursuit of individual liberties. It seems clear to me that freedom to marry who you want, where you want, and how you want would be pursuant to that eidolon. Now, you don't have to agree with that core tenet, but on an empirical level _that rejection_ would be degeneration: a fall from first principals (which might not be a bad thing depending on your normative frameworks - I'm inferring that you're not a fan though).