shinbits said:
If you don't have the conviction that human life is special, then there's no way to reason with you.
A human life is a matter of morals, not intellectual decision.
But, what exactly is it that makes human life special? Is it simply having human DNA? If that is all that makes human life special, then every single one of my skin cells is just as valuable as a person, and I am perpetrating a grave moral wrong when I use a loofah in the shower.
Human life is more than simply the sum of our DNA. What makes human life so special and meaningful is our ability to have connections, to have experiences. And, that requires more than human DNA. It requires the ability to have some level of higher brain activity, beyond just the basic processes of life (respiration, etc.) and the basic brain stem activity.
Do you think it is morally wrong to take someone who is brain-dead (who lacks brain activity in any part of their brain other than their brain stem) off of life support? Is it morally wrong to transplant their organs into a cognizant human being? If you don't believe it is, then you DO think there is more to being human, in a meaningful sense, then just having human DNA.
I think human life is very sacred, but not because there is anything sacred about our DNA. It is sacred because of our ability to have experiences and to have connections. For me, to say that a fertilized egg, or a first-trimester embryo, is a human being whose life is sacred makes as much sense to me as saying that my egg cell that created that embryo is sacred, and a grave moral wrong is being perpetrated when I do not get pregnant in a given menstrual cycle and allow that egg to be expelled and die.
So I think the question is why does human life have value? If it is simply because of our DNA, then there is no reason why every cell in our bodies shouldn't be considered as sacred as a person.