It's one of those topics that don't have a correct moral answer unless you are religious.

Atheist- It's wrong to kill, it's wrong to allow pain and suffering. (no moral answer)

Variable Religion- It's wrong to kill, it's right to allow the birth of a lifetime of pain and suffering because it was planned for the individual by a higher power.

What do I believe in?
I believe that everyone should be given the chance to accept the challenge of life. The "It's my body" argument is false, because it's NOT the mothers body. It's another life.

This is a complicated topic... it will go into "Where does life begin?" and such. Should be interesting if it continues.