What is so "Heart-Wrenching" About Abortion?

Jill Stanek:

...President Obama when speaking at Notre Dame last year, said, "Maybe we won't agree on abortion, but we can still agree that this is a heart-wrenching decision for any woman to make, with both moral and spiritual dimensions."

That inevitably leads to the question, "Why?" What's so "heart-wrenching" about abortion, with "moral and spiritual dimensions"? It isn't heart-wrenching with moral and spiritual dimensions to have one's gall bladder or appendix removed. What makes abortion different?

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