A hypothetical

Part of an ongoing discussion about libertarianism, anarchy, states, and Utopias.

A reader with the chilling name of Iceberg 18 writes: "There is no compelling evidence (in my mind) that suggests that a monopoly provider of justice is better than justice provided by competing private defense agencies."

He asks for evidence, but I assume he means he wants to hear an argument, since there is no question of fact in dispute here, only a question of law and logic.

How would a subscription service ...