True. Anarcho-capitalists are utopian. The state (with its police, army, regulatory apparatus, etc.) is _absolutely necessary_ for the expanded reproduction of capitalism _at any stage_. That said, there is an important difference of degrees, not of kinds. "Mercantilism" -- "laissez faire" -- "monopoly" -- "neoliberalism." As Lenin says, we shouldn't forget "the conditional and relative value of all definitions in general, which can never embrace all the concatenations of a phenomenon in its complete development" (Lenin, "Imperialism: The Highest Stage of Capitalism," _Marxism: Essential Writings_, ed. David McLellan, Oxford: Oxford UP, 1988, p. 154). Each term merely captures the dominant tendency, salient feature, and/or "cutting edge" of new development. Unless you keep this fact in mind, all theoretical terms become useless.
Yoshie