libertarianism demands that everybody gets left alone by outside collectives, in theory at least, in reality it's just anarchy by another name, that's how you get really good roads in rich areas and shit roads in poor areas, bread laced with sawdust/aluminium, and cities stacked with dirt cheap indian workers. communism demands that the state has all the rights all the time over everyone no matter what. i think the slovenian anon is trying to use left/right wing where it doesn't apply but libertarian and communism are directly opposing ideologies. in libertarianism it's not really possible for one group to have all the power because each member within the group has his own resources to employ armed men. under communism someone is in charge and can rescind your access to armed men if he doesn't like you, so communism makes dictatorship more easy. to be a proper dictator under libertarianism you would have to get really lucky with circumstances or be born in to a generations long unbroken plan to own all the power.
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