War and revolution, as the two basic threats, invariably arouse in the State rulers their maximum efforts and maximum propaganda among the people. As stated above, any way must always be used to mobilize the people to come to the State's defense in the belief that they are defending themselves. The fallacy of the idea becomes evident when conscription is wielded against those who refuse to "defend" themselves and are, therefore, forced into joining the State's military band: needless to add, no "defense" is permitted them against this act of "their own" State.

In war, State power is pushed to its ultimate, and, under the slogans of "defense" and "emergency," it can impose a tyranny upon the public such as might be openly resisted in time of peace. War thus provides many benefits to a State, and indeed every modern war has brought to the warring peoples a permanent legacy of increased State burdens upon society. War, moreover, provides to a State tempting opportunities for conquest of land areas over which it may exercise its monopoly of force. Randolph Bourne was certainly correct when he wrote that "war is the health of the State," but to any particular State a war may spell either health or grave injury. - Murray N. Rothbard, The Anatomy of the State

The rhetoric came out of the Wilsonian collective security ideology, which was: if you see armies crossing frontiers somewhere, this constitutes aggression. It means that in the same sense as if he sees Jones beating up Smith on the street, the policeman on the block rushes to his defense, and so therefore the United States and the United Nations become the policemen rushing to defend the victim. ...

In the case of States, you have a completely different situation because this ideology assumes that the Waldavian State and Ruritanian State are somehow the rightful owners of all their territory, just as Jones owns his watch and Smith does, too, and then Smith beats Jones up or takes his watch away from him, this is aggression. The analogy then becomes, if Ruritania invades Waldavia, this means that Waldavian territory, Waldavian property, rightful property, has been taken away from them by the Ruritanian aggressor.

Now the point is for the libertarian that none of these States have any rightful property, that the Ruritanian government does not properly and justly own the entire land area of the country - the property should be owned by individual citizens, the State apparatus has then no title, no just claim. - Murray Rothbard, interview by "Reason" magazine