A possible Solution?

Someone (in another backwater of this galaxy), in a discussion on the question of homosexualty, posed a further question as part of a possible logical progression:

"The planet is overcrowded.
The last thing this species needs right now is another population explosion.
So, is evolution working its magic [in the form of an increase in a non-productive homosexual population] to protect the longevity of the species?"

I pondered that possibility, and a little light came on:
It occurred to me that the discussion had taken a geo-centric tone, and had thus become PAROCHIAL. My friend's comments about overcrowding, and the idea that a seeming increase numbers of a non-reproducing segment of this planet's population (homosexuals), had been naturally initiated (by whatever Darwinian deity we might choose) as an evolutionary process instigated in order to preserve the planet/species, raised an "aha!" flag for me. Yes, I know that last sentence is rather over-long, but it works for me, so deal with it.

Why?

All discussion up to now has hinged on the assumption that this planet is the center of everything, when in reality, Earth “is an utterly insignificant little blue-green planet far out in the uncharted backwaters of the unfashionable end of the western spiral arm of the galaxy.”
See http://tinyurl.com/2gmnt7 for more on that.

Is it possible that in our bent to rationalize/normalize non-productive sexual behavior we earthlings are thwarting a much older plan? Were we, perhaps, intended to be the main source for populating the rest of the galaxy? If so, that non-productive element is standing in the way of progress, and should be transported to Bartledan, where they would likely be more at home.
I may be wrong in this, (God knows I've been wrong before) but perhaps we're going about this population thing all wrong. Perhaps we're meant to force ourselves out of the nest in this manner!

Ever onward!
Don't Panic!
and don't forget your towel!