My personal opinion stems more from "what would I do if my girlfriend/wife was debating about aborting a child I'd fathered?" standpoint than an absolute standpoint. Personally, if it were my child, I would advocate abortion if (a) the mother's life was in danger by having the baby (b) there was no hope of the child having a decent life due to extreme birth defects, etc. (c) rape/incest.

Obviously, I would back up my wife/girlfriend if she got pregnant by me in whatever course she chose. When it comes to someone else's body, obviously I don't have much say in the issue.

The world is a grey place with few absolute situations that work all the time. Personally, I consider it the height of sinful pride for anyone to claim theirs is the only "true" point of view.