If the abortion threatens the mother's life? No limit. Though repeated instances might indicate that there exists a moral responsibility to avoid conceptions and that said responsibility is being shirked.
In all other cases? One is too many.
To avoid making this post simply a repeat, I'll address the potentiality argument being thrown around.
Sperm is potential human life. The zygote/embryo/fetus is human life with potential. The pivotal difference is that sperm is not the sum of ingredients needed for human life. The zygote is. If one were to argue that the nourishment a zygote needs is an ingredient in and of itself, then I would point out that this makes potential humans of us all.
Once all ingredients are joined, we have a human life. All other points from then on are points of potential fulfilled. This fulfillment continues past viability and well past birth.
And simply because an issue has shades of grey, does not mean those shades are indecipherable. Abortion is always killing. Abortion is not always unjustified. It's justified in response to a threat against one's life, just like all other forms of killing.
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I wonder if we're stuck in Rome.
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