"I don't see anything there addressing the claim that same-sex "marriage" will destroy the institution of marriage."
Same-sex marriage will not 'destroy' the institution of marriage. It will change it. Much like no-fault divorce has changed it. Must like welfare and providing financial incentives against getting married has changed it. Marriage will become (has become) more and more meaningless. It's not something that happens overnight.
'Same-sex marriage' contributes, in much the same way as divorce and unwed single parenting, to laying low marriage, and more importantly the family itself, as we know it. Our children need stable foundations on which to build their lives, and family is of prominent importance in that foundation. By continually redefining and softening those basic foundations, we succeed only in placing our children and therefore the future of our culture at undue risk in order to indulge our lust and selfishness. We should think long and hard before depriving our children of a mother AND a father; no matter what the reason.
We have to apply some honest foresight in order to really understand how all of this is going to affect marriage. Consider this article posted today ...
http://www.freerepublic.com/focus/f-news/1158844/posts Male Marital Outlook Linked to Upbringing
By DAVID CRARY, AP National Writer
NEW YORK - While most single young men aspire to marriage, about one-fifth are deeply skeptical of the institution...
The survey, released Wednesday by the National Marriage Project at Rutgers University, found that the men with negative attitudes were far more likely than the rest to have been raised by a divorced parent in a non-churchgoing family. ...
Our children learn by what they see modeled in adults, just as we learned what was modeled for us when we were children. Our culture has been working for quite some time now, wittingly or unwittingly, at bringing down the institution of marriage. If adult males now are skeptical of marriage because of the example set for them through divorce and faithlessness, then consider honestly what affect further weakening and redefining is going to have on our young sons when they're of age to start a family.
I apologize for not being more eloquent in explaining this than I have been. I hope my comments have been of some use, though I really suggest listening to Mr. Prager.