Actually, anarcho-capitalism is the oxymoron since hierarchy is inherent to capitalism. But to ruffle your breeches a little more, no, NO NO, the fundamental question is not in any way related Chomsky, nor is it to explain libertarian socialism. The fundamental question is, why the fuck are capitalists calling them selves libertarians, when they are in fact quite statist?
since only you and chomsky use that tired pharase "anarcho-capitalism" it cannot be called an oxymoron, it is better described as "A Strawman constructed by you and chomsky to discredit capitalism"
capitalism has a longstanding method of action, well established motivations, and a solid backstory.
Your "Libertarian Socilaism" is the perplexingly complex, and apparently purposeless Rube Goldberg Device that requires explanation.
yet despite many requests for clarification, none has been forthcoming.
capitalists can in fact be libertarians, since capitalism and liberty are not mutually exclusive.
if you can pull yourself away from your tireless work at the local Build-A-Bear, where you put in a full days work constructing shabby strawmen, perhaps you could explain (finally) the motivation, method and logic that governs "Libertarian Socialism"