I agree that libertarianism is not a good form of government, as capitalism does not do certain things well, like healthcare, eldercare, etc... . Using the term 'democracy' vs. liberalism is problematic here. I think a better term is 'democratic socialism' in the Bernie Sanders use of the idea. This provides market regulation. The opposite of this is free market capitalism which is neoliberalism.

Not arguing with your premise, just the terms used.