—“So in examples where civilization does effectively vet and cull the underclass, how before long the golden age, and how long before the descendants destroy what their ancestors built? Can they do it on their own or do they always import/strengthen an underclass?”—Ahila Livingston

^Exactly the problem. That’s right.

At some point The middle class seeks profit at the expense of the nation (polity, or genetic distribution).
National Socialism was an attempt to change this – unfortunately it was stated in german prose rather than english and as such moral rather than scientific – and that curse has harmed national socialism ever since.

So the problem is constraint of the middle class just as much as constraint of the upper class and the underclass – which is only possible with full accounting under the natural law of reciprocity.

We never wrote a ‘bible’ of natural law. And it’s time we did. 😉