My question too. I don't know about you but if I KNEW that if I had a child and that it would more than likely die of starvation or disease I wouldn't bring a child into the world. Maybe if they kept their population in check there'd be more food to go around.
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On the contrary, you'd bring lots of children into the world, in the hopes that at least a couple would servive and provide for you in your "old age" (say, 43 or 44)
Only if I were a very selfish person.