Suppose it could only be harvested from actual babies - does it then become a miracle to get it, to - you know, save lives? What if it came from adults - and, you know, you'd have to go round up some old folks or some homeless people, kill 'em off and swipe their precious bodily fluids?
Kinda reminds me of Oliver Goldsmith's A Moderate Proposal (that's the one where he proposes that the Irish eat their children to solve the two problems of overpopulation and starvation).
I guess at heart, I don't trust the general character of the human race not to be barbaric in the face of such things - I think there are plenty of people who would be willing to do whatever it takes. I'm reminded of a show I once saw where people were offered immortality but they had to kill someone to get it. People would do it.
Ok, ok, it's all a little far-fetched. Maybe. I just think this kind of thing just reinforces my thinking that, whenever someone wants to win a point on a subject, two tried and true points get raised. One is - trot out how the children will be affected (hey, it's working for Hezbollah now). The other is, hey it will save lives! But really - it's just going to make you look better.
Now if we could only use those embryos to make a better gasoline!