You are asking extremely basic questions. Try again after you've read the post I linked.
Alright. I can see the usefulness of deontology in determining if an abortion doctor acted in a way worthy of praise or blame, but I feel as though the issue isn't whether or not we put abortion doctors in prison, or whether we allow mothers to have abortions. The issue comes down to whether we want to live in a world where every possible potential human is realized, and has the opportunity to exist. Since humans are just a pattern of neurons, this goal isn't realizable today, since the possible human "JohnWittle who, while writing a comment on a blog...
A few years ago, I wrote a little dialogue I imagined between 2 materialists, one of whom was for and one against abortion, centering on the personal identity question. I recently cleaned it up and added a number of references for the biological claims.
You can read it at An Abortion Dialogue.
Early feedback from #lesswrong is that it's a 'nicely enjoyable read' and 'quite good'. I hope everyone likes it, even if it doesn't exactly break new philosophical ground.