Any.
It's more Kong Qiu, actually. We each "decide" what is right-thinking because we are each sensitive to the best way that the world should be.
Behaving virtuously is behaving in accord with your beliefs. That you have beliefs at all, I guess, would be the "standard" (if you insist that there be one).
I have no doubt that Adolf Hitler, being human, engaged in virtuous behavior. We all do to some extent.
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He certainly sounded like he believed what he was saying.