I've been thinking about this lately. Let's tell a story;

At first babies don't know how to move around. Then. at some point they learn to crawl - and that is perfectly natural. Also, learning to stand and to walk is natural, we are genetically pre-programmed towards learning to walk. So, following the natural path we learn to walk, to run, to jump and leap and to dance.

But let us imagine a remote society where all the adults would just crawl around. A baby born in that society would see everybody crawling and no-one walking. Would a baby learn to walk? Or would (s)he just follow the example of the parents and others? I guess that the child would keep on crawling, too.

Then one or two adults in that society accidentally discover how to stand and how to walk. They try to tell it to the others, saying: "hey, look, this is far more effective, an easier and faster way to move around. You should try it too!". Some of the others try for a second, but fall down and get themselves hurt. They judge the whole walking business as un-natural and stupid hippie thing. "It is natural for humans to crawl, so let's just stick with it! If you try to restrict our freedom to crawl, our society would run into problems and everybody will get hurt!"

Oh well. There's nothing wrong with the argument "it is natural to crawl". It is only that it is equally natural to learn to stand and to walk...

Primitive morality served us well when we were still primitive tribes living in the wilds. But nowadays, as a humankind, our techonology is so advanced that if we want to survive we'd better follow our natural path of development in morality, too. To Learn more about natural benevolence and co-operation.