We don't need a new twist on libertarianism to "modernize it." But, we do need a new breed of libertarians who recognize the practical realities of human nature.
We don't have to worry about paying for foreign capital any more than we must worry about paying for foreign oil. Both trades benefit the domestic economy.
Governments have always thrived on the fear of the taxpayers, and the DHS secretary is sure that if we knew what he knew, we'd "never leave the house."