Some left libertarian positions support collective action to dismantle hierarchical power systems. It’s just difficult (impossible?) to maintain this sort of group orientation at scale; it inevitably devolves into factional power seeking/domination politics.
You're referring to various strains of anarcho-libertarianism, correct? I'm more familiar with geolibertarianism as a left-leaning libertarian faction, which doesn't have these stability problems, but does have a huge initial-conditions problem (it's nearly impossible to institute a land value tax in a society that doesn't already have one because of the effect it has on land prices, which are a primary storage form of wealth).