Politico, you overstate the connection between genetic fitness and parental assessment of a gay child. Trying to impute psychological behavior from some sort of scientist's-eye view of reproducibility is a significant error in your argument. Fitness is merely a selective mechanism - if you were saying that people who a militantly anti-gay were more likely to produce offspring, and that was borne out by facts, and therefore gay-haters are selected for, you'd have a point. But this "straights hate gays because of genetics" thing is pretty retarded on its face. Put bluntly, people do not, in fact, think with their d**ks (DNA delivery systems).
Look, if you really need concrete proof about what I am talking about people can do a simple study where you interview parents of newborns in hospitals. Ask the parents one question with a promise of complete confidentiality/anonymity: "Do you hope your newborn is homosexual?"
Personally, I think such a study would be a complete waste of time because I guarantee you will not get a single person answering in the affirmative.
Because most parents of newborns are idiots?
And anyways, people would be far more likely to say they don't
care if their child is heteronormative or not, than to say they hope that their child is gay. Because hoping your child likes teh vagoo or teh cawk is stupid.