Well to be fair, shouldn't we examine the other side? If you're unwilling to have abortion, are you willing to have all of us, as a society, pay for and take care of and just generally deal with the many, many underprivileged children that would then be born, for the rest of their natural lives, or however long it would be necessary?
I support birth control and abortion because hey, life is great, and you shouldn't have to live a crappy life because of a mistake. A fetus doesn't know it's alive yet (so far as we can tell). I'd rather it not experience a life of want and suffering for no reason, just to teach its parents a little responsibility. It's not worth it. You shouldn't ruin three people's lives for something like that. What if the mother has a miscarriage, is she prosecuted for neglect or manslaughter or chance-medley (look it up, awesome word) or murder? No, of course she isn't. If the fetus is going to be made a human citizen, then it needs to always be one, and that's not a precedent I want to set. If you want to protect something that thinks and feels, how about chimpanzees, that are experimented on every day? Never heard a pro-life person give a crap about that.
And yes, life is great, but every day, we make choices that, by degrees and minutes and seconds, kill people. I didn't give change to a homeless person yesterday. I probably .0001 murdered them. There's no binary distinction between entirely ruining a life and not. Every action we take, however small, has an effect, and we have to prioritize. We'd go crazy if we spent all our time trying to save life.