It would misunderstand these men and women to say they disrespect the idea of marriage. Their plea is that they do respect it, respect it so deeply that they seek to find its fulfillment for themselves.A graphical representation of data compiled from the GSS over the last few years:
No less respectable a media organ of the Cathedral than The New York Times reported the same half a decade ago.
If the presumption is that marriage precludes extramarital sexual activity, then it seems reasonable to argue that opening it up to same-sex couples does in fact "disrespect the idea of marriage".
Perhaps it's time for that aspect of the definition of marriage to change as well. Expect it to be the next big Cathedral objective after the holy warriors are done mopping up any residual resistance to transgendering.
Parenthetically, lest there be any doubt about the Cathedral's zeal for the gay cause, consider it utterly dispelled.