The single political action that provides the greatest return for any people, is

The single political action that provides the greatest return for any people, is to suppress the breeding of the unproductive and expand the breeding of the productive.

The only answer that I can come up with is that while harsh cold climates facilitated this eugenic process, in modern era, we must simply pay unproductive people not to bear children, and punish them severely with the withdrawal of funds if they do.

The institution of private property is a method of self defense. Then institutional cost of eugenic reproduction is again, simply a method of self defense.

Unfortunately, due to the errors of christianity, the enlightenment, and the socialist state, we do precisely the opposite.