Earlier quoted context omitted.
If everyone stockpiles individually for themselves and their families then you have a massive distributed cache that is more resilient that a centralized warehouse that can be bombed. You seem to think the responsibilities of "the state", "the military" and "individuals" are distinct. They're not. Some individuals like to pretend they are, and rely on the government to do X (and some governments play the same game an…
But they won't stockpile individually, because it's in no one's individual interest to stockpile. (This is an example of the Prisoner's Dilemma). I agree with you that "reality will always assert itself" but I'm having a hard time understanding how anyone things that Libertarianism can be that reality.
I completely agree that Libertarianism can't be retro-fitted onto any existing human society.