Nature is unnatural. Prove me wrong.
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There seems to be a primary delusion around that natural is good, and 'unnatural' is somehow bad.
A two step disproof.
First, a counter-example.
Natural law of gravitation means it is natural for all elevated objects to fall down.
Therefore you are morally bound to jump off tall buildings.
Which is absurd.
Second, an issue of definitions.
What do you in fact define natural as? Human actions result from human choice bound by human nature, and the universe around us. Hence, it is natural for humans to interact in homosexual intercourse, because it occurs naturally within the bounds of human nature. It is natural for people to masturbate, because in isolation, without commands to do so, natural instincts allow it to happen. A motor car is a natural created by the branch of nature that we call man.
There is, realistically speaking, no objective boundary between natural and unnatural. Only ones placed by our own subjective feelings of how things 'ought to be'. Trying to argue for a judgement based on whether something is natural is therefore no different from saying – I think it should be that way, and therefore it should be that way.
And so, the application of the idea of natural in a debate is a waste of time.