I was following the comments on this post and wrote a response that turned out to be long enough for a post. So here goes:

Here is my principled (not utilitarian) argument [against anarchism].
To implement the non-aggression principle, people must agree on what constitutes aggression, not just at a philosophical level but at a more detailed level. For example, firing a gun in the air is not aggression but firing it close to someone’s residence is. Even if I am a champion shot and the bullets do not hit anyone. That might not be the best example, but the point is that some of these distinctions are not philosophical but merely a matter of convention or reasonable definition. If such distinctions are not made beforehand, then the non-aggression principle is meaningless. Establishing the process by which people can agree to such distictions is what politics is (should be) all about. Saying that each person must form his own answer and never commit to any answer (committing would mean agreeing to be bound by it) is an abdication of politics. As you mentioned, politics only arises in a social context and therefore must involve social processes. Because these distinctions depend on convention (by necessity, not for any lack of good philosophy), there is a need for legislation – a process by which people can agree to and modify (when necessary) conventions.
So the answer to Rothbard’s question “how does the state get the authority to govern?” is:
By the delegation of those who choose to form a state. Ideally, the state would be formed by those who subscribe (philosophically) to the non-agression principle. If someone does not recognize the authority of the state, he is not harmed by the state. Unless he breaks its institutionalized definitions of aggression. As long as the state does not break its own definitions of aggression and as long as the definitions are not philosophically wrong, the mere existence of a state is not aggression against any individual.

As I wrote above, anarchism is an abdication of politics. It is merely a moral position that states: man should not submit to be bound by legislation. The answer to that position is merely “Don’t submit”. The funny thing is: I dont know of any sane anarchists who follow that moral position. A seemingly political way of framing anarchism would be: “In an ideal society, no organization of people should have a monopoly over the exercise of force.” But that is a thorougly contradictory position. What sort of monopoly is being referred to here? Metaphysical or existential? If it is metaphysical, then we already have anarchy, since no state can have a metaphysical monopoly on force (or on anything else). If it is an existential (or de facto) monopoly that the anarchist wants to abolish (not the right word, the right word would be ‘wish away’), then the anarchist is claiming that other people should not grant their consent to a de-facto monopoly on force. But then, that is a moral position.

Psychologically, an advocate of anarchism is saying:
I refuse to be bound by <i>any</i> institutionalized principles. Even if I agree with those principles today. I do not wish to take responsibility for my beliefs. The desire for anarchism is not a desire for freedom from aggression – it is a desire for freedom from responsibility.

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