by some twisted miracle libertarianism happens to be even less sustainable than communism. unlike the latter, libertarianism just advocates that society be completely ungoverned and abandoned and people left to their own devices, which is essentially some wild west slash feudalism stuff where everyone has an average lifespan of 25 thanks to the complete lack of any centralized medical system or police
communism advocates some amount of organization, while libertarianism just advocates zero organization and interference. in a communist country walking across the street could earn you a trip to the gulag. but in a libertarian country crossing the street could lead to a loving armed war