This is really not a valid objection. It is fairly well studied, and it's known as an "appeal to nature." You can see some info on it at these places: * http:/

This is really not a valid objection. It is fairly well studied, and it's known as an "appeal to nature." You can see some info on it at these places: * http://www.fallacyfiles.org/adnature.html http://www.fallacyfiles.org/adnature.html * http://en.wikipedia.org/wiki/Appeal_to_nature http://en.wikipedia.org/wiki/Appeal_to_nature It's largely ignored in philosophical discussions because of the issues mentioned in these pages (and more!).