[RealJames]

I'll give my 2 cents on this.

I saw the Freakonomics movie and thought the section with crime-rate, namely murder, having reduced by up to 50% in the us 20 years after Roe v Wade as being pretty damning evidence supporting abortion.
A good point made in the movie also is that a woman who has an abortion isn't necessarily having fewer children but rather having them at a later time when she can provide it with a better life.

The value of a fetal life is in fact a considerable factor. But how about the value of the lives murdered due to high crime rate caused by unexpected/unwanted pregnancies? Those lives who may have children of their own etc.
And how about the life of the mother, which may well be stunted by being forced into early motherhood.

I think adoption is a more viable solution but if all abortions were to become adoptions the orphanages would be full by the end of the month.