Stated very simply, I face reality and admit that not only isn’t there anyone at home upstairs, there isn’t even any upstairs. I have one life and I intend to make the most of it. Therefore it follows naturally that if I firmly believe this, why then I cannot deprive another person of their turn at existence. Only the very self-assured political and religious zealots kill people in order to save them.
I also like this bit (from the same Hutton Delusion post) on the value of life:
Like diamonds, like gold, like principled politicians and non-libertarian hard SF, life is precious because it is an irreplaceable and finite commodity. Those who assert an eternal afterlife do not, as they claim, give our lives more worth and more meaning. They turn them into meaningless, relatively short precursors to the main event.
In fact, the whole post is worth reading. Go take a look.