The independence of the economic sphere was a tenet of faith with Liberalism
Man as a pure animal does not exist
A political theory seeks to find from history the limits of the politically possible
The early American arrived at a land of which he knew nothing
Pessimism only describes an attitude, and not facts, and hence is entirely subjective.
As a world view, Darwinism cannot of course be refuted, since Faith is, always has been, and always will be, stronger than facts