Self-oriented, lightly founded moral philosophy is not so new after all. Going back some 350 years:
Doubtless there are natural laws; but good reason once corrupted has corrupted all…. The result of this confusion is that one affirms the essence of justice to be the authority of the legislator; another, the interest of the sovereign; another, present custom, and this is the most sure. Nothing, according to reason alone, is just in itself; all changes with time. Custom creates the whole of equity, for the simple reason that it is accepted….
Veri juris. We have it no more; if we had it, we should take conformity to the customs of a country as the rule of justice. It is here that, not finding justice, we have found force, etc.
Justice, might.—It is right that what is just should be obeyed; it is necessary that what is strongest should be obeyed. Justice without might is helpless; might without justice is tyrannical. Justice without might is gainsaid, because there are always offenders; might without justice is condemned. We must then combine justice and might, and for this end make what is just strong, or what is strong just.
Justice is subject to dispute; might is easily recognised and is not disputed. So we cannot give might to justice, because might has gainsaid justice, and has declared that it is she herself who is just. And thus being unable to make what is just strong, we have made what is strong just.
Blaise Pascal, Pensées, 294, 297, 298. (I hasten to add that Pascal was not writing in support of this position.)

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