If mercy killing is the issue, in truth it makes little difference if they were born or not. If you wouldn’t kill them after being born I don’t know why you would before - from a mercy point of view.
The family may soon be faced with an even tougher decision than the decision to abort would have been. As is the case with many conjoined twins, their circulatory systems and hearts aren’t working well enough to support both of them. This usually gets worse rather than better as they grow. At some point, the decision is often whether to hurry up and kill one, to have any chance of saving the other, or to sit by and watch both die, knowing that one very likely could have been saved.
http://www.canada.com/vancouversun/story.html?id=10929eb1-742c-43a3-9571-8b10f0960e1d&k=14563
> If you wouldn’t kill them after being born I don’t know why you would before.
> No human life, no matter the physical disability, is disposable.
Hear! Hear!