At a conference in Santa Barbara, California, that I went to recently, David Velleman gave a very interesting talk that focused on the following puzzle.
Suppose that Karen, a 14-year old girl, decides to conceive a child. Having a child at such a young age will make life very hard for Karen, and for her child as well: in general, Karen will have a much better life if she delays having a child for another 10 years or so; and the child whom she would have 10 years later would also have a much better life than any child whom she conceives today. So we might accept the statement that she ought not to have a child at her age.
But then Karen's child is born; she names him Max. Max is now a member of the community, and we are committed to treating him with concern and respect. So we are now most reluctant to accept the statement that Max ought not to have been brought into existence. But we know that if Karen had not had a child at the age of 14, Max would not have been brought into existence.
The puzzle is, Aren't our attitudes towards these two statements inconsistent? Yet surely they could both be the appropriate attitudes for us to have towards Karen's (and Max's) situation!
I shan't try to outline Velleman's intriguing solution to this puzzle here. Instead, I shall simply outline the solution that I'm inclined to favour (below the fold), in order to see what PEA Soup readers think of this.
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