I think abortion views and abortion views when it comes to law have to be split up.

Obviously as SB said, it's a very hard and long process to prove rape, but I am okay with abortions in the case of rape.
Incest would be easier to prove I assume, and I am okay with abortions in that case.

I am not okay with the "my boyfriend doesn't want to wear a condom so if I get pregnant I'll just have an abortion" or "my boyrfriend broke my cd player and I had an abortion to get back at him" (exact words spoken from a girl behind me in class last year)

My point being, how can you pass a law that would say it's okay to have an abortion in x,y,z cases but not in a,b,c cases when 90% of the cases are hard to prove. Obviously my views on abortion will not change because of a law or lack of a law but maybe as new technology is created new laws could be passed.