There is the fine line. If the government were to be a supreme system over the economy, there would be fewer checks and balances and the government itself would be indirectly advocating social Darwinism. The government would be the "strong man" outdoing the weak economy. In a system of checks and balances, charity is maximized and social exploitation of the weak is sought to be minimized. This is all ultimately based on morals of a different kind than would be advocated by Spencer.