I didn't find it tired or stupid at all. In fact, one of the few times when a politician said something sensible: not being a scientist (and here once can use that term in a broad sense), he has no clue of course on whether "gayness" is "inborn" or not. Further, as he accurately pointed out, it should not matter. If commentators in the gay community are betting their all on the theory that being gay is "inborn", that would be a pretty tired and stupid accident, indeed!
(I am not implying you, Michael, are taking a position above. I do think your description of the affair -- societal policing -- is exact).
--ravi