No one may threaten or commit violence ('aggress') against another man's person or property. Violence may be employed only against the man who commits such violence; that is, only defensively against the aggressive violence of another. In short, no violence may be employed against a non-aggressor. Here is the fundamental rule from which can be deduced the entire corpus of libertarian theory.
Murray Rothbard[Professional politicians] don't mind if price controls cause shortages of health care. In fact, they welcome the prospect, because then they can impose rationing; they can impose priorities, and tell everyone how much of what kind of medical care they can have. And besides, ... there's that deeply satisfying rush of power.
Murray RothbardWe must, therefore, emphasize that 'we' are not the government; the government is not 'us.' The government does not in any accurate sense 'represent' the majority of the people. But, even if it did, even if 70 percent of the people decided to murder the remaining 30 percent, this would still be murder and would not be voluntary suicide on the part of the slaughtered minority. No organicist metaphor, no irrelevant bromide that 'we are all part of one another,' must be permitted to obscure this basic fact.
Murray RothbardI define anarchist society as one where there is no legal possibility for coercive aggression against the person or property of any individual. Anarchists oppose the State because it has its very being in such aggression, namely, the expropriation of private property through taxation, the coercive exclusion of other providers of defense service from its territory, and all of the other depredations and coercions that are built upon these twin foci of invasions of individual rights.
Murray Rothbard