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Edited on Fri Feb-06-04 07:13 AM by DemBones DemBones
person. If she were fully formed, she'd have a normal brain like the fully formed twin does. For some reason, the embryo in this case divided incompletely, creating conjoined twins instead of identical twins. We're used to thinking of Chang and Eng and other examples of two complete humans joined by some physical connection, but not all conjoined twins are such distinct persons.
I saw some conjoined twins on television once who looked like one girl with two normal looking heads. As I remember, their torsos were basically fused into one torso with an arm on each side and four legs. The heads were definitely two different people. The girls were about 8-10 years old as I recall and I seem to remember them running, riding a horse, and swimming. Their parents were trying to raise them as normally as possible. I don't remember what surgery had been discussed but the parents had decided against it because it was too risky. In that case, there were two different persons, I think, because there were two separate brains, yet you could say they have one life that they're sharing.
Edit: These are the twins benburch mentioned above! I remember them saying "We're two girls with one body."
Anyway, you're contrasting the rights of an abnormally formed person with no prospects for normalcy or even for a separate life, against the rights of her normal twin, who has the usual prospects for a normal life. Perhaps the abnormal twin has a partial life but the normal twin has more rights, I think, because the abnormal one will never be viable. In abortion, the pro-choice argument is that the mother's rights trump the fetus's, at least until viability. The pro-life argument is that the fetus has as much right to live as the mother does because a developing fetus is like a blueprint constructing itself. The fetus is dependent on the uterine environment until viability but if dependence takes away its rights, then children who are dependent on others could also be said to have no right to life. Peter Singer argues that it is morally permissible to kill young children but I don't think most people agree with him,. Even if it's an interesting proposal to discuss in a class, not many of us would really support infanticide and I don't even know a word for the killing of toddlers.
It's possible some pro-life people would oppose this surgery but it's not the same as cases where surgeons separate conjoined twins, selecting one to live and one to die, when both could live as long as they are left as they are. Those are very troubling, especially a case in England where the parents didn't want their twins separated, knowing one would be sacrificed, but the government ruled that the surgery must be done.
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