The Friendly Hermit

I'm not entirely certain it's a way to "demonstrate their non-homophobia" so much as an actual belief that there's evidence for the genetic/biological basis for homosexuality. There's been a lot of conflicting studies over the years, and media does not report adequately on scientific literature anyway. It's easy for people to latch on to information and not realize the caveats inherant in the original studies, etc, regardless of what the subject of study is--health, homosexuality, etc. I think suggesting the reason heteros support the "gay gene" theory is a tendency to demonstrate anything other than their (albeit limited) understanding of the literature is to make quite an assumption.