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Winners in the genetic lottery themselves, blessed with good health and unusual intelligence, they seek to deny future parents the chance to give their children an equally promising genetic start. In a despicable moral equivalency, they equate loving parents with Nazis.
Biomedicine does have the potential to alter the human experience. Indeed, it already has. Life expectancy has doubled worldwide in the past century. Childbirth is no longer a peril to mother and infant. Childhood is no longer a time for early death. The pervasive sense of mortality that down through the ages shaped art, religion, and culture has waned.
Our lives are different from our ancestors' in fundamental ways. We rarely remark on the change, however, because it occurred incrementally. That's how culture evolves and how science works. We should let the process continue.