Jesus fucking Christ, go read the research into the issue of rising infertility rates and see where they are getting their data from. That's where the people are. You think scientists just make these numbers up? Just because you don't constantly hear about it in the news means it doesn't happen? Are you dull?
I don't give a fuck what pre-agriculture tribes did. We don't live in a pre-agriculture society. The point is that no authority should have control over the reproductive health of another, that unethically violates the autonomy of the individual and leads to eugenics.
People are not starving due to the rising populations; this is a bullshit, shortsighted framing of the argument that is rhetorically deceptive. They are starving due to the unethical distribution of resources. They aren't starving because they have more mouths to feed, they are starving due to systemic oppression preventing them from accessing readily available resources with which to feed those extra mouths while a small percentage of humanity consumes excessive amounts of those resources while forcing wasteful production practices to chase after imaginary tokens of perceived value.
If we weren't being forced as a society to produce so much excess for these small minded moguls of industry and restructured society to incentivize sustainability over profit generation, we would have more than enough to go around.