I would agree that a life rate of 50%, or even 20% or 10% would still be worth it, but I don't place any moral value on a fertilized egg. In addition, I agree that having fertilized eggs die incidentally is not really systematic murder, or even callous. Most Christians, I think, would agree that it's still moral to bring a child to term even if that child had only a chance of survival - if God wants to take those fertilized eggs or embryos back, let the blood be on his hands, not ours.
But the same arguments would apply for IVF. We have accepted that to get a baby, we have to accept a high failure rate for embryos - so now we're just haggling. To that end, embryo screening is a boon, not a burden. By screening out obviously unviable embryos, we are improving the chances of success, not lowering it.
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Notes -
I would agree that a life rate of 50%, or even 20% or 10% would still be worth it, but I don't place any moral value on a fertilized egg. In addition, I agree that having fertilized eggs die incidentally is not really systematic murder, or even callous. Most Christians, I think, would agree that it's still moral to bring a child to term even if that child had only a chance of survival - if God wants to take those fertilized eggs or embryos back, let the blood be on his hands, not ours.
But the same arguments would apply for IVF. We have accepted that to get a baby, we have to accept a high failure rate for embryos - so now we're just haggling. To that end, embryo screening is a boon, not a burden. By screening out obviously unviable embryos, we are improving the chances of success, not lowering it.
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