If society demanded that government be based on the principle of non-aggression, and all of it's services were funded voluntarily, is it still government?
Myself, and others get hung up on the anarchy bit, feeling a need to maintain a public organization for, and by the people, but also agree that it must adhere to the principle of non-aggression. Other organizations, private or public, should be able to compete, and everything must be done in adherence to voluntarism, free of coercion/extortion.
Why draw an anarcho-capitalist line, when we could draw a non-aggression capitalist line?