I think this is a little strong. Laws that are designed to regulate conduct are of little use unless an effective means to enforce them and/or punish their breach also exists. I submit that no effective international form of enforcement exists, not that no international law exists.
A lack of agreement about norms does not mean that those norms do not exist. Your claim is a variation of the fallacious argument from ignorance ("I do not know of any universally accepted norms so there aren't any" would be the basic argumentum ad ignorantiam) Perhaps folks simply have not reached the appropriate level of "mental maturity" to uncover those universally applicable norms. If evolutionists are correct, then humans and human relations are, after all, a work in progress.
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