If your neighbor is murdering his girlfriend in his living room, even though you don’t have his okay to be on his property, it’s justified to barge in and save his girlfriend, right?
If no, why not? If yes, continue…
In this situation, you do not own your neighbor’s living room. It is your neighbor that is the rightful owner of his livingroom. Provided you don’t hurt any innocent people, you can stop the act of aggression he is committing on his property.
Suppose the government of Ruritania, instead of funding itself with taxation, raised revenue with a loser-pays court system, voluntary donations, a lottery, and seeking restitution from criminals (those who have aggressed against others) both for their victims and for the cost of sending the police to stop it/pursue/incarcerate the criminal.
In Ruritania, the NAP is the law. The government of Ruritania will allow for private defense and even private courts, provided these private institutions follow the government’s laws, which adhere to the NAP. The only competition they will not tolerate is a private defense company that does not adhere to the NAP. They will eliminate any institution that does not adhere to the NAP. You have no choice but to adhere to the NAP.
Ruritania has a totally open immigration policy. If private property owners want foreigners on their land, peaceful foreigners will not be prevented by the government of Ruritania. They will only prevent someone from immigrating to Ruritania when the immigrant has demonstrated he or she has not abided by the NAP in their homeland and are not likely to in Ruritania. In other words, if the immigrant would be arrested in Ruritania for what he or she did in their homeland, the immigrant would not be allowed to live in Ruritania.
The government doesn’t conscript, tax, force testimony of, etc., anyone.
To my knowledge, there has never been a government like this in the history of the world. Also, if such a government were to be established, it would not be likely that it would stay like this forever. And this is assuming the government translates the NAP perfectly into law. I’m not arguing that living under the government of Ruritania would be more desirable than living in an an-cap society. The question is whether or not this State would be “a gang of thieves writ large”.
Remember: the monopoly of law is the NAP, and the state is not funded through coercive measures. Even though the government of Ruritania is not the rightful owner of any property, it seems legitimate to me for it to exist only to enforce the NAP, just as I may enforce the NAP in my neighbor’s livingroom, even if I don’t own his livingroom.