I have seen some of the common arguments for anti-natalism, one being David Benatar's asymmetry argument. I am worldbuilding for a science fiction story in which there are some technologically-advanced aliens. They are considering what they should do with regards to humans and other Terran organisms. For context, the aliens are considering creating a species of enhanced humans. These enhanced humans are created not by humans but by the aliens in laboratories, which they then bring to Earth. So, the aliens can create as many of these enhanced humans as they please.
Some of the aliens take a more anti-natalist perspective, citing the lack of consent for coming into being and the asymmetry argument. If a pro-natalist alien argues that anti-natalists deny potential lives the right to be alive, then an anti-natalist might say, "Suppose we go with your plan of creating some of these enhanced humans. When do we stop making them? For every number of these enhanced humans we create, you could always argue that there is another potential life being denied the right to live. We could go on producing arbitrarily many enhanced humans, and you would never be satisfied. It is better to avoid that dilemma altogether and just not make any enhanced humans". The amount of resources or even space is not an immediate issue for the aliens due to their technological developments. Creating these enhanced humans does not take very long, either. This is why I say this is more of a theoretical argument against pro-natalism; humans do not have the ability to create as many people as they want in a short amount of time. What could a potential counterargument against the anti-natalists look like?
(I know that this probably could have gone in the Worldbuilding Stack Exchange as well. I just think that it is philosophical enough to be more appropriate here.)
EDIT: Being more specific, I would say that the aliens could choose to produce, say, 1,000 individuals. But this seems like a really arbitrary number. Why not just make one more individual? Or 65 more? There is no clear line as to when to stop producing these enhanced humans. Any enforced limit feels arbitrary, but limits based on factors like too few resources or too little space do not lend themselves to strictly defined limits. There is a gray area because one more person is not going to strain the amount of resources or space available, but maybe a million will. That's the issue I'm trying to get at. Another thing that I should specify is that these aliens plan on replacing humanity entirely with these advanced humans, so the new humans will have Earth to themselves and if necessary could even live on other planets. The aliens are just deciding whether they should create a new civilization loosely based on humanity to inhabit the Earth after the original humans are gone.