Preference? I too took this perspective for a long time, but then I realized something: it IS justifiable to have laws against murder, there is no preference in it. If there can be no law outlawing murder, there should be no laws whatsoever. There are certainly some things the state SHOULD be able to tell people not to do, and killing others is a pretty understandable one.
In the vast majority of cases, our laws say that murder applies to human beings who have been born and are functioning on their own. There are exceptions to this when the term of pregnancy is almost complete and it is clear that the intention of the woman was to give birth.
Also, as I stated in another post, if you truly believe that allowing a woman to decide regarding her own pregnancy is equivalent to murder, you should be preparing for another civil war where millions of mature, functioning human beings would be killed.