Rothbard is referring to political philosophy… ‘natural law as science’ is the section that quote is from.
Which makes this as obvious as night and day, because at the end of that natural law section we have:
"IT IS NOT THE intention of this book to expound or defend at length the philosophy of natural law, or to elaborate a natural-law ethic for the personal morality of man. The intention is to set forth a social ethic of liberty, i.e., to elaborate that subset of the natural law that develops the concept of natural rights, and that deals with the proper sphere of “politics,” i.e., with violence and non-violence as modes of interpersonal relations. In short, to set forth a political philosophy of liberty.
In our view the major task of “political science” or better, “political philosophy” is to construct the edifice of natural law pertinent to the political scene." - Chp 5, TEOL (The Task of Political Philosophy)
Additionally (foot note to the text you quoted);
[3]See H.W.B. Joseph, An Introduction to Logic, 2nd rev. ed. (Oxford: Clarendon Press, 1916), pp. 407–9. For a hard-hitting defense of the view that causation states a necessary relation among entities, see R. Harre and E.H. Madden, Causal Powers: A Theory of Natural Necessity (Totowa, N.J.: Rowman and Littlefield, 1975).
You should probably go do that.
Wrong. You are again making the same mistake I mentioned above, that post which you & others ignored.
Chapter 6 - Crusoe Economics, Rothbard is dealing with the individual [personal] here,
“If Crusoe economics can and does supply the indispensable groundwork for the entire structure of economics and praxeology—the broad, formal analysis of human action—a similar procedure should be able to do the same thing for social philosophy, for the analysis of the fundamental truths of the nature of man vis-à-vis the nature of the world into which he is born, as well as the world of other men. Specifically, it can aid greatly in solving such problems of political philosophy as the nature and role of liberty property, and violence.[2]”
[2]Such seventeenth- and eighteenth-century constructs as “the state of nature” or “the social contract” were not wholly successful attempts to construct such a logical analysis. Such attempts were far more important than any actual historical assertions that may have been made in the course of developing these concepts.
Tell me, where any of your out of context quote deals with anything that is political, refers to violence, sphere of rights, aggression or criminality. No where - because he’s talking about the individual here, personal ethics. Not political philosophy.
Once again, your post fails to make the distinction - as Rothbard has CLEARLY done, yet obviously not clear enough for some… or maybe he did, and those who continue to turn a blind eye should realise it is their failing, not his:
“For we are not, in constructing a theory of liberty and property, i.e., a “political” ethic, concerned with all personal moral principles. We are not herewith concerned whether it is moral or immoral for someone to lie, to be a good person, to develop his faculties, or be kind or mean to his neighbors. We are concerned, in this sort of discussion, solely with such “political ethical” questions as the proper role of violence, the sphere of rights, or the definitions of criminality and aggression. Whether or not it is moral or immoral for “Smith” — the fellow excluded by the owner from the plank or the lifeboat — to force someone else out of the lifeboat, or whether he should die heroically instead, is not our concern, and not the proper concern of a theory of political ethics.[5]” - Chp 20 TEOL
Rothbard’s brief explication of objectivity within individual / personal ethics, can be seen as merely an aid to objective political philosophy.
The critical and unique facts about man and the ways in which he must live to survive—his consciousness, his free will and free choice, his faculty of reason, his necessity for learning the natural laws of the external world and of himself, his self-ownership, his need to “produce” by transforming nature-given matter into consumable forms—all these are wrapped up in what man’s nature is, and how man may survive and flourish. Suppose now that Crusoe is confronted with a choice of either picking berries or picking some mushrooms for food, and he decides upon the pleasantly tasting mushrooms, when suddenly a previously shipwrecked inhabitant, coming upon Crusoe, shouts: “Don’t do that! Those mushrooms are poisonous.” There is no mystery in Crusoe’s subsequent shift to berries. What has happened here? Both men have operated on an assumption so strong that it remained tacit, an assumption that poison is bad, bad for the health and even for the survival of the human organism—in short, bad for the continuation and the quality of a man’s life. In this implicit agreement on the value of life and health for the person, and on the evils of pain and death, the two men have clearly arrived at the basis of an ethic, grounded on reality and on the natural laws of the human organism.
If Crusoe had eaten the mushrooms without learning of their poisonous effects, then his decision would have been incorrect—a possibly tragic error based on the fact that man is scarcely automatically determined to make correct decisions at all times. Hence, his lack of omniscience and his liability to error. If Crusoe, on the other hand, had known of the poison and eaten the mushrooms anyway—perhaps for “kicks” or from a very high time preference—then his decision would have been objectively immoral, an act deliberately set against his life and health. It may well be asked why life should be an objective ultimate value, why man should opt for life (in duration and quality).(5)
In reply, we may note that a proposition rises to the status of an axiom when he who denies it may be shown to be using it in the very course of the supposed refutation.(6) Now, any person participating in any sort of discussion, including one on values, is, by virtue of so participating, alive and affirming life. For if he were really opposed to life, he would have no business in such a discussion, indeed he would have no business continuing to be alive. Hence, the supposed opponent of life is really affirming it in the very process of his discussion, and hence the preservation and furtherance of one’s life takes on the stature of an incontestable axiom.
(5) On the value of life not depending on whether it is perceived as one of happiness, see Philippa R. Foot, Virtues and Vices (Berkeley: University of California Press, 1978), p. 41.
(6) Elsewhere, I have written: “if a man cannot affirm a proposition without employing its negation, he is not only caught in an inextricable self-contradiction; he is conceding to the negation the status of an axiom.” Rothbard, Individualism, p. 8. Also see R.P. Phillips, Modern Thomistic Philosophy (Westminster, Md.: Newman Bookshop, 1934-35), vol. 2, pp. 36-37
Look, when you’re resulting to quoting massively edited sentences, out of context and attempting to refute a large part of the edifice of liberty - you’re going to run into problems and err. My suggestion to you and others would be to put down your microscopes and get a “more complete picture”.