Was that directed at me? The person with the pretty consistent track record of stating "let folks do to themselves what they want, but don't do unto others what they don't want. i.e smoking, murder, killing people cos they're sterile". Or are you suggesting that because someone is sterile and therefore unable to reproduce that it'd make them my earlier mentioned "six foot tall organ storage unit" because of course reproducing is the only reason people live. (Is it worth mentioning that the inability to have kids is part of the opposition of gay marriage, yet no one minds sterile people being married.) I'm not saying "If science proves something then kill em".
I'm suggesting that you would still think killing someone cause they're sterile is wrong, and would say that this is something your society should not allow, because you place value on the fact that it's a conscious being regardless of sterility, and so you should not kill that being without its consent. Similarly, pro-life people place value that something is human (defined by whatever criteria they define it by, I'm currently going with "completed genome"), and say that you should therefore not kill it. They disagree with your assertion that it's only the mother's body in question, it's also the child's. And while you make a different value judgment than them about what should be protected neither value judgment can be said to be objectively right or wrong.
The point I was making is that sure science can tell us when something happens, but it's philosophy that tells us why we should care about that thing. Your philosophy is that consciousness is what's important (or actually that's mine, but you seemed to agree with me...), theirs is that the fact that it's a separate genetic human entity is what's important, but it's all just philosophy, it's not objectively verifiable.