morality is subjective and people don't have free will

[Angrboda]

If there ever evolved a politics to where living at the expense of the young was considered wrong, we might open up additional options for self termination.

Hopefully you find that idea terrifying, on the same par as forced sterilization of the mentally challenged and/or eugenics.

No, not particularly. I trust the moral instinct to arrive at decent solutions to the problems of living. Many people are mortified at the prospect of abortions. Many aren't. It's the collective response which determines morality.