Sustainability is one factor of the debate, but the most important one is the one you stipulated out of the picture: how well each system would satisfy the goal of protecting property. The big problem I see with minarchism as you stated it, is that the moment people start seceding, you devolve into a polycentric order. In order to keep a single legal order, you would have to use force against those that try to create rival legal institutions, which already puts this system on a weaker footing than polycentrism regarding protecting property.
You’re certainly correct that minimal statism is per se a violation of the NAP. If a minimal statist intends to make an argument on the basis of sustainability, he must acknowledge that fact. In light of this, a minimal statist might set up the comparison between anarcho-capitalism and minimal statism (with respect to their respective levels of sustainability) as follows:
minimal statism: we begin with minor violations of the NAP, but as a result we get a stable society - e.g. the minimal state might fulfill its intended role without expanding its powers for 30 years. Those are 30 good years for liberty, not perfect but damn good.
anarcho-capitalism: we begin without any violations of the NAP, but as a result we have a less stable society - e.g. the polycentric legal/security order unravels within 3 years as monopolies develop, and a state emerges which has greater powers than the minimal state would have. Now, those were 3 awesome years for liberty, but it was only 3 years, after all.
Is there any objectively justifiable way to choose one scenario over the other? No.
Given these two scenarios, it is objectively true that the minimal statist scenario is 10x more sustainable than the anarcho-capitalist scenario. If sustainability were the only variable, then we could objectively justify our choice of the former over the latter. However, sustainability is not the only variable: the two scenarios do not begin at the same point - that is, they are “sustaining” different states of affairs. We can call this other variable “purity:” i.e. purity of adherence to the libertarian ethics, the NAP. The anarcho-capitalist scenario has 100% purity: it does not admit of any violations of the NAP whatsoever. The minimal statist scenario, while quite pure, is not 100% pure. You might be thinking that there’s a problem with quantifying purity, and there is, But if we say that a system which admits of no exceptions to the NAP is 100% pure, then we can at least say that minimal statism is less than 100% pure, even if we have no rational basis for assigning minimal statism a specific number on the purity scale.
So, given the two scenarios, we know that minimal statism wins in the dimension of sustainability, and that anarcho-capitalism wins in the dimension of purity. Those are objective truths. But, in order to objectively justify our choosing one system over the other, we have to establish some objectively verifiable relation between sustainability and purity, such that X amount of sustainability = Y amount of purity. Of course, this is impossible: as it is impossible to establish an objectively valid ratio of apples to oranges, or a “just price.” Each individual subjectively determines how many apples he wants to trade for a given quantity of oranges, and that is the “correct” ratio/price. Likewise, every individual must choose how much “purity” they might be willing to trade for a given quantity of “sustainability,” if any.
However, I am not a minimal statist. I am advocating a stateless society which contains an institution which superficially looks very much like the minimal State - but it’s not truly a State. It doesn’t have the coercive powers that a State has. For the sake of argument, put your objections to the side; I realize that I will need to explain what I mean, and demonstrate why such an arrangement is viable. I’ve already hinted at my reasoning: i.e. a natural monopoly (i.e. one which is not enforced by coercion) in the “law industry” is viable because of the unique characteristics of the “law industry.” I’ll get to making this case at some point soon; maybe later this morning. For the moment, I just want to finish the discussion started above. So, for the sake of argument, assume that my nightwatchman pseudo-State is possible.
Now, I avoid the problem faced by the minimal statist. Remember, the reason that the minimal statist is unable to prove that we libertarians should choose a less pure but more sustainable minimal statist society over a more pure but less sustainable anarcho-capitalist society is that there is no objectively valid “price” of sustainability in terms of purity, or vice versa. But, my system of pseudo-statism is just as pure as anarcho-capitalism; neither admits of any violation of the NAP whatsoever. Therefore, we can drop purity altogether; it’s no longer a variable relevant to the comparison between the two systems. We are now comparing anarcho-capitalism and my pseudo-statism only on the basis of sustainability. It’s no longer apples and oranges; now it’s apples and apples. And, as you might have guessed, I’ll argue that my pseudo-statism is much more sustainable than anarcho-capitalism. If that turns out to be the case, then we are objectively justified in choosing my pseudo-statism over anarcho-capitalism.
Keep in mind, this is only the outline of the argument. I’ve worked out the logic of comparing anarcho-capitalism with either minimal statism or my pseudo-statism; but I’ve been using only hypothetical scenarios. For my part, I still have to demonstrate that: 1) my pseudo-statism is viable at all, and 2) that this pseudo-statism is more sustainable than anarcho-capitalism. If I do manage to succeed in proving those two points, the anarcho-capitalists will be logically compelled (as explained above) to recognize that my pseudo-statism is preferable to traditional anarcho-capitalism (supposing of course that we all agree that sustainability and purity should be the two criteria in terms of which we make our decision).
The other way the debate needs to be framed is in non-legal/political terms. What cultural factors and institutions need to be in place in order to acheive statelessness? Whether we like it or not, the state plays a large paternal role for most people, even if they don’t technically rely on it economically or politically. Historically, the church played this role, but the church is pretty much irrelevant now. Anarcho-capitalism, if it is ever going to be acheived, can’t rely on everybody changing there hearts, it needs some sort of large scale cultural institution which fills the father-role without actually governing. This is one place where minarchism suceeds, because it can keep the visible parts of government in tact (president, congress, ceremonies) while its inner workings drastically change.
I agree. And this need for some organizing structure, to safeguard libertarian ethics in a stateless society, is what motivates me in suggesting “pseudo-statism.” In my experience, much of the arguing back and forth between minarchists and anarcho-capitalists is a result of the latter’s unwillingness to talk about the shape society will take in the absence of the State: as if this question is unimportant, as if abolishing the State per se guarantees the success of libertarianism thereafter. I always find it slightly ironic that individuals who want the State out of the business of organizing society have so little interest apparently in taking on the job themselves; society will still need organizing. That need doesn’t vanish with the State, it just becomes a task for individuals, working through cooperation rather than coercion.