...denying a woman an abortiion would be as unreasonable as denying her laxatives if she were constipated... - exactly. It IS as unreasonable - to those of us who think of a pregnancy as being a woman's body part.

identical twins do not share the exact DNA - Yes, they do, the exact same, nuclear and mitochondrial. They have different fingerprints because fingerprints are not 100% genetic. Neither is personality, which is why they consider themselves, and are, distinct people. There is a case right now in the news somewhere about a woman who slept with identical twins and now cannot say, and neither can the DNA tests, which is the father of her child.

Cells from adults are not "a possible potential human being in the same way a sperm cell" because sperm are haploid, and cannot be technologically made into humans, but ass cheek cells (or any other except red blood cells, which are enucleate in humans) are diploid and CAN be cloned into a full human. So masturbation isn't murder - but cleaning out your fingernails is. If "potential" people are people, that is.

And science doesnt "fail" to address morality - it has nothing to do with it. It is intelligence that makes science and makes (or should make!) morality. What the Nazis did was horrible - but if they collected good data, their science wasn't "bad" -Note that they didn't, in most cases - but if they had, which would be worse - not using the data because of how they were collected, or using them despite how they were gathered?