Hmmm I think it's important to emphasise that anarcho-capitalism necessarily relies on coercion, but it's probably a strawman when speaking about its philosophical defenders. Libertarians want to maximise the account of freedom they build up from the originating premise of self-ownership. They are perfectly willing to license the use of coercion to uphold that propertarian system of rights. What they have issue with is the existence of an overweening state that has de facto and de jure power over you no matter what. They want the means of coercion to be privatised; to be outsourced to local militias, private security firms, and the like.
Of course, like all ideologies, they don't think of this as a system of accumulated power that exploits destitute workers and relies on dystopian bands of warlords to beat anyone who protests into submission, but as something like 'a pure state of freedom'.
