It’s difficult to refute the idea that human life is valueless by itself without working from Christianity as a premise. The simple Christian answer is that human dignity comes from being made in the image of God and loved by him, and it is utterly clear from scripture and tradition that God loves each man, not merely men who are loved by others, have reached a certain size or complexity, exist in a certain space (outside of the womb), or have measurable brainwaves. It takes a pretty shallow Christian to think God’s love is dependant on those things.
The best secular argument against the idea that human life by itself is valueless is the world that such logic leads to. What does make a human life valuable then, if not the fact that it is a human life?
Is it that society says a human being of a certain size or stage of development is valuable? What happens when society changes its mind and decides 2 year olds are nothing more than evolving molecules? Child abuse becomes moral. Raping 2 year olds then becomes moral. Is that the world you think we life in, where society gets to decide who has worth and who doesn’t? Is that the world you want to live in?
Is it only human beings that are valuable to society that have a right to life? Could you best friend, or spouse, or mother suddenly become handicapped tommorow, and become unable to work, and thus become nothing more than a worthless lump of molecules? If you believe that the value of human life is dependant on value to society, you wouldn’t be mad if I murdered you best friend when he become no longer able to work, right?
Is it only human beings who have reached a certain stage of development that deserve life, or only human beings who can feel the pain of being murdered who have a right to life? If you could no longer feel pain tommorow because of that medical condition that impairs one’s sense of feeling, would I have the right to murder you?
I can play this game all day, but the point remains the same: The minute you base the value of human life on anything other than the fact that it is human life, you turn the kingdom of God on earth into hell. I ask you honestly: If human life is not valuable in-and-of itself, what makes some human lives valuable?
I apologize honestly is this post was too forceful, I do get carried away sometimes. God bless.