I accept the biological argument, but people wanting their own kids are bloody selfish. We've got waaaay too many people, and good kids needing good parents are overlooked for more bloody resource-devourers.
I didn't choose to have my daughter, of course I love her, but i'm not going to pretend that it was good sense to breed.
This is complete goddamn nonsense. If the current generation doesn't breed at least at replacement levels then our entire system, from bottom to top, is going to completely collapse. And don't feed me any garbage about how much ecological damage we're causing because it is far to fucking late to try to use that argument. We aren't going to be able to even stabilize things unless we start using our resources much more intelligently, and that sure as hell won't happen if we regress to goddam subsistence farming.
We all have a basic biological imperative to try to continue our own genetic line, it isn't any more 'selfish' of me to have a family that I can support than it is for some central African or southeast Asian who CANNOT to have multiple children. In fact, I'd argue that I am in a massively better position to make that choice.
You don't get to decide what is or isn't selfish, society as a whole does.
edit: If I have, in fact, misunderstood your argument again, then I apologize. I'm gettin' real sick of this particular bullshit attitude I see floating around lately tho'.