I think just letting it exist without turning it into a "less than" or "disorder" type class of people is the only fair way. The brain is so mysterious in so many ways that make us unique, don't get clinical, have respect for the struggle they face instead of adding to it.
I think the debate needs to be framed properly.
I use the terms "disorder" (but never Less than) because its accurate to the circumstances.
If you can find me a more proper term, I would gladly adopt it.
There are three possible reasons; choice, biology, environment.
Choice is the reason most oft trumpeted by homophobes. It is also the least likely for any rational person.
Environment has merit, however, it would have negative consequence for gays wanting to adopt a child. There is also too much evidence out there to show that folks raised around lots of gays have no more chance at being gay than others.
Biology is the only option left. Yet this also seems to piss off gays because if biology makes one gay, it also makes one a pedo or a sheep shagger.
Sexual preference is sexual preference, be it for same sex, opposite sex, animals, children, or inanimate objects. Normal gets to be defined as what the super majority is. As I've said, I've had a cock in my ass, I'm not sure I'm normal, although I feel no attraction towards men, but I have fucked one. Either brain cemetery or anatomy decides preference.
So again, give me a proper term and I will adopt it.