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These negative-sum games of coercion and extortion lead to highly inefficient outcomes, and they can only be avoided by carefully crafting the ex ante rules to avoid such coercion and extortion. These coercive threats that make negative-sum games possible, and that decrease the payoffs of positive-sum games, cannot be neatly distinguished in practice from innocent externalities: any act or omission of one party that harms another, i.e. any externality, doubles as a threat, whether a tiny threat or a large threat, from which an extortion premium, its size depending on the size of the threat, can be extracted. In order to try to distinguish coercion, and the extortion it gives rise to, from an "innocent" externality that can be cured by efficient bargaining, there are ways to exclude some of these extreme possibilities from the prior allocation of rights. And indeed criminal and tort law do this: they distinguish purposeful behavior from negligent, and negligent from the mere unfortunate accident. But any such ex ante distiction contradicts the claim that the Coase Theorem applies to any prior allocation of rights. Voluntary bargaining cannnot give rise to tort and criminal law. Quite the opposite is true: at least a basic tort law is necessary to make voluntary bargaining possible. Tort law (and the associated property law which defines boundaries for the tort of trespass) is logically prior to contract law: good contracts depend on good tort and property law. Without a good tort law already in place, nobody, including the "protection firms" posited by anarcho-capitalism, can engage in the voluntary bargains that are necessary for efficient outcomes. This is not to claim that the polar opposite of anarcho-capitalism must be true, i.e. that "the government" along the lines we are familiar with is necessary. Instead, a system of political property rights that is unbundled and decentralized is possible, and may give rise to many of the benefits (e.g. peaceful competition between jurisdictions) promised by anarcho-capitalism. But political property rights are not based on a Rothbardian assumption of voluntary agreement -- instead, in these systems the procedural law of political property rights, as well as much of substantive property rights and tort law, is prior to contract law, and their origin necessarily involves some degree of coercion. Political and legal systems have not, do not, and cannot originate solely from voluntary contract. Both traditional "social contract" justifications of the state and the Rothbardian idea that contracts can substitute for the state are false: in all cases coercion is involved, both at the origin and in the ongoing practice of legal procedure. In both cases the term "contract" is used, implying voluntary agreement, when the term "treaty", a kind of agreement often forced by coercion, would far more accurately describe the reality. The real task for libertarians and other defenders of sound economics and law is not to try to devise law from purely voluntary origins, an impossible task, but to make sure the ex ante laws make voluntary bargaining possible and discourage coercion and extortion (by any party, including political property rights holders or governments) as much as possible.
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