We don't kill people to show killing is wrong. We kill people to punish them for murder. It's about justice, restitution, some deterrence (albeit debatable) and fairness.
If you take someones life unjustly (murder), how is it fair that you get to continue living yours after you took away that of someone else.
Away from the death penalty now. Is it acceptable to kill to save yourself or others? If a madman breaks into my home in the middle of the night and I feel my family is threatened or some thugs jump out of a dark alley armed and threatening me and my family; is it acceptable for me to use deadly force? Would that be murder? What if the imminent harm wasn't to my family but I am witnessing the atrocity? May I then act with deadly force to protect an innocent?
Now what if there is an ongoing atrocity that the law was insufficient to protect people from ie. it was not "illegal" by the powers that be? Perhaps it is a concentration camp and the "powers that be" are doing nothing to stop the innocents from being herded into the showers and in fact participating in the process (government funded abortion lets say).
Do my personal morals which tell me this is wrong get trumped by the state or should I act on my conscience and attempt to save further innocents from harm?
How is a baby who is viable outside the whom any different? Because it is inside another innocent who is "suddenly" at risk? What of my children who are already living outside of my wife's body? They put her health, well being and "lifestyle" at risk everyday. She no longer has the same freedoms over her own body as she had before children. We are now legally responsible for their well being and supervision and can not just come and go and do as and when we please. We have added stress to our lives which we all know is unhealthy and add'l burdens financially, logistically and emotionally.
Would it be ok with you if I punctured one of their little skulls & sucked their brains out to make things a little easier and less risky? I can choose one of our younger ones if that will make you feel ok with it. Or perhaps my eleven your old girl, she is a real handful. Life would sure be easier and less of a health risk with her gone. Or maybe one of my fourteen year olds? Boy or girl, you pick.
Lastly, where do we get our rights? From the state? I was under the impression that the state was their to PROTECT our unalienable rights. You know, the ones this great nation was founded upon. Endowed by a creator; the right to life, liberty and the PURSUIT of happiness. As soon as the state is no longer functioning within that capacity, what obligation do I have to continue to mindlessly follow under it's reign of tyranny?
This subject is deep and complex (speaking of OP) and it is difficult if not impossible to arrive at THE correct answer. We are either dealing in absolute finite truths or of infinite feelings and opinions; inevitably a smidgen of both. Who is right, who is wrong and who am I to say? Who really does, if anyone, have the rights of life and death? Do we live within a universe created and dictated by a set group of universal moral and physical laws or one of unguided randomness where we are on our own to decide what we feel is right or wrong and it doesn't really matter anyway because this life is all we have and after it is gone there will be no accounting of our actions so eat, drink and be merry for tomorrow you die?