No scientist is unbiased. Some just use methods that are more independently verifiable than others are.
This is far from over, scientific inquiry, that is. Just wait. I know it's a tough pill to swallow for some of you guys, but don't be scared. We're not going away and we don't bite.....hard.
I'm not sure who "we" are (I suppose you mean the amalgamated horde of sexual misfits our society has produced) and I'm not sure why you believe "science" is on "your" side. If your side is Herek's, then science has indeed been a cruel mistress for him and a great ally of we Herek critics.
Herek was among those predicting an epidemic of heterosexual AIDS in the US - an eventuality which never happened. Those of us who pointed out that the only people who had anything to fear from AIDS were perverts, addicts, persons who consort with perverts and addicts and those foolish enough to rely on municipal bloodbanks - why, we were proved correct.
The "gay gene" shell game is also falling apart - and was based on flawed reasoning to begin with.