The problem is that these "very true" ideas have gone out of fashion for a reason: they don't scale. It might all be well and good to say "be civilized or I'll kick the shit out of you" when you're trying to sort out a neighbourhood dispute; but when you scale them up to, say, foreign policy, you're just courting armageddon. Our world is getting bigger and bigger, trying to fit it into old ideological boxes is only going to generate more misplaced (literal) crusades.
The really good and true methodologies actually scale properly in every direction, but they're harder to dumb down.