I wonder if the opposite is true as well. That is, when theses sorts of discussions come up, I'm always asking: when is it over? When does the sacrifice stop? A person sacrifices for their kid for some nebulous better life, which their kid goes on to do for their kids...ad infinitum? However, through an evolutionary lens it make some sense: an individual doesn't have to have time to enjoy any advantage they've accrued through such previous sacrifice because evolution doesn't care if you're happy, just that you're reproducing successfully, and so far that's instilled (it's arguable) an instinctive sense to socially rise in order to obtain better access to such. So in such a sense there really would be no point of it being over (except for the extinction of the species). So why shouldn't someone in this great chain of sacrifice say no and kick their feet up and enjoy the fruits of all that sacrifice? This would explain why we (society at large and various specific social groups) treat the childless so negatively and use the term anti-natalist as a slur.

However, there is another component to it: one's advantage is always relative to others' lack of advantage. This is why equal access education will never be truly supported (no matter what people say); if all kids have the same advantage as their kids, then their kids don't actually have any advantage at all (in social terms).