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What's right or wrong depends on the choice of morality. This is not an absolute like you are pointing out. I personally prefer to choose a probabilistic logic together with a case by case approach when it comes to dealing with human interactions, instead of a Boolean logic and axioms of behavior.

There is such thing as objective right and wrong. Moral relativism is satanism.
Try treating others poorly and see how your life turns out, you'll soon discover natural law.