Single facts almost never slay worldviews, at least not right away. - Stephen Jay Gould

I do not see why we should reject all genetic engineering because its technology might, one day, permit such a perversion of decency in the hands of some latter-day Hitler—you may as well outlaw printing because the same machine that composes Shakespeare can also set Mein Kampf. The domino theory does not apply to all human achievements. If we could, by transplanting a bacterial gene, confer disease or cold resistance upon an important crop plant, should we not do so in a world were people suffer so terribly from malnutrition? Must such a benefit imply that, tomorrow, corn and wheat, sea horses and orchids will be thrown into a gigantic vat, torn apart into genetic units, and reassembled into rows of identical human servants? Eternal vigilance, to recombine some phrases, is the price of technological achievement.

The history of a species, or any natural phenomenon that requires unbroken continuity in a world of trouble, works like a batting streak. All are games of a gambler playing with a limited stake against a house with infinite resources. The gambler must eventually go bust. His aim can only be to stick around as long as possible, to have some fun while he's at it, and, if he happens to be a moral agent as well, to worry about staying the course with honor.

We live in an essential and unresolvable tension between our unity with nature and our dangerous uniqueness. Systems that attempt to place and make sense of us by focusing exclusively either on the uniqueness or the unity are doomed to failure. But we must not stop asking and questing because the answers are complex and ambiguous.