Why I am not Quite a Libertarian, revisited

I have been asked in condescending words what part of the natural law proposed by the Libertarians I do not understand. The Libertarians are natural-law theorists who have an elegantly simple axiom of legal principle: whoever initiates force is in the wrong. Force is to be used only in retaliation and only against the aggressor, and then only in proportionate retaliation. It is as elegant and simple an answer as a Hobbesian saying that the only passion in the human breast is the desire to avo...