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I think it boils down to practicalities and logic rather than morals which just get in the way. People pic and choose morals anyway we have to think differently in this century.
I think different societies have different moral norms. Some societies have left weak or handicapped children out to die in the woods to die, others have forced abortions while others deny contraception. It's nice to think that these practices could be regulated by logic but I think there are cultural forces that will overpower reasoned examination anytime soon. I do think that most of the custom has been shaped by nature or societies self interest.