The Anti-Abortion Fallacy

From the FuturePundit:

"The human reproductive system produces a lot of genetically damaged embryos. Think about that. Two thirds of pregnancies end before women even know they are pregnant. Some additional percentage miscarry after a woman knows she's pregnant. Consider these facts in light of religious beliefs held by some that at the moment of conception a spirit is somehow attached to the fertilized egg. Does God attach spirits to all these fertilized eggs that are doomed to never attach to the uterus or that initially attach but fail due to genetic damage?

Consider this result in light of the recent work by Rudolf Jaenisch and Alexander Meissner at MIT's Whitehead Institute to create mouse embryos that can can not grow a placenta. This results in embryos that can not develop very far. Their goal is to find ways to develop embryonic stem cells that will not elicit as many objections from some religious folks. Nature (or God if you prefer) already generates lots of embryos that can not develop into humans. Likely most embryos created naturally lack that capacity. Doesn't that fact make the Jaenisch and Meissner approach more ethically acceptable?"