(1) Intentionally killing innocent human beings is wrong
(2) The unborn is an innocent human being from the moment of conception
(3) Therefore, killing the unborn is wrong
Most prochoice advocates used to argue that the unborn is not human, just a blob of tissue or a parasite or something to that effect. Now, however, people are starting to take issue with premise (1). People like Judith Jarvis Thompson and David Boonin are now granting prolifers premise (2) by saying, yes the unborn is a human and is essentially identical to the adult it will be. But they argue it is justified to kill it anyway.
(...)
The new abortion rights advocate is saying that we may kill human beings. Why? Because human beings do not have value in and of themselves. They don’t have intrinsic worth. There has been a steady shift in the culture to say that humans don’t have this kind of value.
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