Even if there was an established causality here, which I very much doubt, social engineering is a pretty dubious reason to allow abortion. Protecting the rights of the mother is a better reason. I'm creeped out by the idea of the state forcing women to bear children against their will.
I also think suicide should be legal because the state ought not to force people to live against their will, so I guess you'd say I'm strangely libertarian when it comes to issues of life or death.
BTW, there are philosophical underpinnings behind the idea that a fetus isn't a person. Seems less cold than simply stating that you can't murder what isn't a legal citizen. I don't think that personhood is something that should flow from the state, either.
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