I think at this point, you are looking for answers that cannot be given.
Why are human carbon based and not nitrogen based?
Why don't we have six toes over five?
Why do brown eyes have to be dominant over blue eyes?
The answer is because that's just the way it is and it has nothing to do with our social behavior. These are things beyond our control at this point. A 20 year old's body is in better shape than a 40 year old's. It is better equipped at the time to deal with the stress of carrying a baby (Or two or three). Clearly, the female body is going to favor a process that involves not killing the mother as that is bad for reproductive success.
Why are human carbon based and not nitrogen based?
Why don't we have six toes over five?
Why do brown eyes have to be dominant over blue eyes?
The answer is because that's just the way it is and it has nothing to do with our social behavior. These are things beyond our control at this point. A 20 year old's body is in better shape than a 40 year old's. It is better equipped at the time to deal with the stress of carrying a baby (Or two or three). Clearly, the female body is going to favor a process that involves not killing the mother as that is bad for reproductive success.
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