I guess Stef said it well. The NAP is just another way of saying "Dont be a dick". There are stil subjective human decision being made about what is considered aggression and what not. They say about pollution "Thats different" "-Everyone- who is -Sane- accepts a little pollution" I can't say I disagree with that. But how much pollution is okay and what is not? somewhere some jude or other person has to make this decision. Having a state isn't a solution. Having the NAP isn't a perfect solution either (but nothing is a perfect solution). How do you make sure the judges are reasonable and not brided? Difficult to answer. the key would be having a balance of power. And that means to reject unreasonable rates of taxation because thats just a form of extreme disbalance of power.