Final-Fan: I don't think I can be more explicit. Letting nature take its course is hardly murdering anyone, whereas killing the person we've created is the opposite of that. I'm not sure I understand why you are confused. If we prevent the fertilized egg from being implanted, we are just preventing the process from getting to the point where personhood is obtained - like any other form of contraception, only at a different point in the process.
In Memoriam RVW Jr.
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