""Libertarianism and extreme capitalism" are great for people who are intelligent and driven."

It's good for people that want to rationalize their extreme wealth as "meritocracy" when it's inherently luck of the draw that any of us find ourselves where we are. A real libertarian society entails an informal economy and is what the developing world is trying to get out of. State policy is needed to maintain some kind of social order, a libertarian government is the complete inverse of a command and control economy - both are social disasters.