I should clarify a bit: I don’t think most true marriage supporters can make a rational arguement either. Most people actually can’t, as logic isn’t taught in public schools. This isn’t new, as most people throughout history were uneducated and ignorant about many things (we are saved by faith, not by knowledge; the educated Christian needs to be reminded about this often

).
So, most people I agree with can’t rationally justify their position, however, many on the true marriage side of the debate will admit that their position is grounded on the purely religious anyway. Same-sex “marriage” advocates, however, love to claim that their position is the most (and only) rational position, yet they have nothing to show for it. It’s this hypocrisy that also puts me at odds with the so called “enlightened” advocates.
I especially cringe when I hear same-sex “marriage” advocates compare themselves to those in the Civil Rights movement. They are less about searching for the truth, and more about asserting their will, which just happens to be enslaved to the passions (and the current fads of the times), like a brute beast. Of course, many of the advocates believe that truth is relative anyway, which can be changed through social advocacy, or at least that is the logical conclusion of their position
Christi pax,
Lucretius