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Best argument for antinatalism is that we simply do not for sure what happens upon death. It could be nothing, like we think, or it could be some natural hellish state. There could be some quirk of physics, or some evil AI takes control and resurrects people to torture them, that makes hell a reality. Quantum Immortality could be hellish if its possible.
So if you do reproduce, you better be sure the suffering really ends at death.