I agree, a scientific explanation shouldn't be necessary, but in our twisted world it sure couldn't hurt.
I sympathise with this viewpoint. After decades of anti-gay discourse (classic example Christian Tim LaHayes urgently intolerant The Unhappy Gays), it's kind of heartening to see a vigorous response from the scientific community. No, I don't think scientific research will seal the argument; but it goes along way from the mumbo-jumbo emanating from the multiple anti-gay voices saying, in various ways, that sexuality is as simple as a choice and as ephemeral as a sin. Hell, it was as recently as just over 30 years ago that homosexuality was finally removed from the Diagnostic & Statistical Manual of Mental Disorders.