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Richard Dawkinsが繰り返し記述するネタのひとつに「人間から人間でないものへの連続性」がある。それは「神の似姿で創造された人間という人間を特別視するキリスト教の基本的なポジション」と対置される考え方である:
Human means special, unique, sacred, of infinite worth, to be venerated as the possessor of "human dignity." Animal means to be treated kindly but put to human use, painlessly destroyed when usefulness is past, killed for sport, or as a pest. A rogue lion that kills people will be shot, not in revenge, not as a punishment, not as a deterrent to other lions, not to satisfy the relatives of the victim, but simply to get it out of the way: not punishment, but pest control. A rogue human who kills people will be given a fair trial, and if sentenced will probably not be killed. If he is killed, it will be with grisly ceremony, after appeals, and in the face of massive, principled objection. Of all the justifications offered for capital punishment, one that will never be heard is pest control. It has no place in penal theory. Humans, to the absolutist mind, are forever divided from "animals."
A real, live Lucy would drive a coach and horses through this double standard. Of course we already know that we are cousins of chimpanzees. But the intermediates are all conveniently dead, so it is easy to forget. If we succeed in cloning a Lucy and a series of graded, mutually fertile intermediates linking us to chimpanzees, what would the pro-"lifers" do then, poor things?