Engineering the human germline: an exploration of the science and ethics of altering the genes we pass to our children

[N]o one has the guts to say it, [but] if we could make better human beings by knowing how to add genes, why shouldn’t we? […] Evolution can be just damn cruel, and to say that we’ve got a perfect genome and there’s some sanctity [to it]? I’d like to know where that idea comes from, because it’s utter silliness.