>>> More people living doesn't necessarily mean people
living better lives. In a finite world with limits to
growth, relaxing one bottleneck only leads to the next
bottleneck.
Its not that people think gosh I have 1000 more calories, I will have another child, its that without those 1000 calories either the mother dies before or during pregnancy or the child dies after, of starvation.Granted there are now lots of other things to kill the child, malaria etc, but I guarantee every single person on HN will rather take the chance of malaria than the certainty of not being born in the first place.
I also guarantee that most of HN places themselves on the "not yet happy" side of the fence, so I find your argument which seems to be "its no good bringing another child into this world, they might not die of starvation but something will get them, and they will never be happy" to fly in the face of, well, millions of years of evolution. We've always been unhappy.
More people is a good thing, more people, and in a world that knows it should use its wealth to provide decent sanitation, opportunities, education, peace and justice, it is an unalloyed good.