Neither Sowell nor Friedman were members of the Austrian School which seems to be a hallmark for Libertarianism.
However, the failure of both of those theories seems to be the tendency to ignore the political realities posed by democratic institutions.
We have a gigantic government because that is what the People thought they wanted and they had the votes to create it. Democracy will overrule proper policy on many occasions.
So then you agree that we're more a democracy than anything else?
Given that admission, and the fact that failure to pay taxes [particularly property] results in the government taking property (and therefore is not really your property, but 'on loan' from the government) -- Would it be utterly inaccurate to say the current state is also socialist in nature?