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In the comment to the OP below, I explain better what I mean. The short version is failure to be kind to others, and to trangress such natural law is something even dogs will punish their ilk for. Dogs are a different species, and have different social rules and biological imperatives, making the natural laws of dogs different than those applicable to us, as well as on a completely different intellectual level.

That does however indicate what I mean by natural law, which can be ferreted out in specifics (for those that overintellectualize and ignore their gut feelings) by comparing various cultures and ascertaining those societal rules that are nearly ubiquitous, while usually being negated by some cultural feature or another in specific instances. I reckon that latter is caused by malicious parasites that pervert society - whichever specific society they exist in - for their aggrandizement.