Well, the question is what right do you have to make assumptions about another person's kid? Some might want you to have an opinion on their kid, but many, many people would not. I knew somebody was going to pose the hypothetical "why don't I just kill my daughter because she inconveniences me?" But I can retort with an argument that pro-lifers usually use.
In car accidents where a pregnant woman's fetus is killed, the offending driver is charged with infanticide. Well, you might be asking yourself "Self, why is it considered "infanticide" in car accidents, but not in abortions?" The difference is that aborted fetuses are unwanted by the parents, i.e. the people who created the fetus do not want it. But a woman carrying a baby would usually only be carrying because she wanted the baby. If a third party, outside of the fetus' creators kills the fetus, it's infanticide because that third party had no right to determine the fetus' future. Do you see the distinction?
Now when you look at the issue like this, you can see that society over-all views fetus' rights individually depending on how its parents do. Society agrees for the most part that when you are born, you become a genuine member of the human race and you become a citizen of whichever country you were born into. So your "kill my daughter" argument doesn't fly because killing her would just be plain murder because she has already been born. A fetus' right to life is dependent on what its parents feel and cannot be dictated by any third party because only the creators have the right to make a decision regarding its future.
