Inquisitor:
So do tell, how does one argue against slavery without some 'abstract' theory of rights? On account of its barbarism? Then demonstrate why this alone suffices, on grounds of an 'abstract' theory of rights that this is sufficient to render slavery undesirable. The problem of course, is, self-ownership isn't the only 'abstract' theory of rights. They all are, the Rawlsian no less than the Objectivist views. So much for 'abstract' theories of rights, then.
Yes, on account of its barbarism. That's also what utterly rips apart the "Taxation is theft!!!" argument, or should say war-cry.
By simply looking at it, and seeing how it shows total disregard for human life and offends the conscience of every rational, civilized person.
Ethics can't really be firmly established on philosophy, only justified and discussed, assuming we make the same basic assumptions. Abstract theories of rights are important, but only in as much as they improve the individual human condition.
A regard for human life is taken as axiom because it's only through a mutual regard for eachothers' well-being that we actually
further eachothers' well-being. This is what it means to say that freedom and justice are reciprocal. All ethics, including the ethics of liberty by classical liberals, are founded upon it. You see this most clearly in Adam Smith's
The Wealth of Nations and Milton Friedman's
Free to Choose.
If Rothbard, through his sophistry, happens to come to the conclusion that a holocaust is justified for his own liberty's sake, his entire argument falls apart because his basic assumptions about the value of humanity contradict that of just about everyone.
If "human life" isn't important to you, if you're not a Humanist but look at other human beings as insects to be limitlessly bought, sold, and used for our own freedom's sake, then we have no grounds to discuss ethics at all.
Rothbard seems to not make any assumption of humanity's value at all, but takes simply his own life to be valuable and tries to convince the world to capitulate to his idea of freedom, for his own sake. Had you been born a sickly child in Sparta and tossed away or a neglected child in an American ghetto, Rothbard sees nothing wrong with this.
If you see nothing wrong with it either, simply because you and Rothbard, by chance alone, were not born in Sparta or an American ghetto, then we have no way of discussing what's "right" at all. But you certainly have no claim to be an individualist, unless by "individualist," you mean psychotically narcissistic, which Rothbard seems to be.
This psychological evaluation seems to fit, based upon Justin Raimondo's description of the man:
http://www.againstpolitics.com/austrian_economics/steele_rothbard.htm
Murray fancifully saw
himself as something of a libertarian Lenin.
While his dogmatic invective and propensity
to conspire may sometimes have seemed reminiscent
of the founder of Bolshevism, Rothbard was
too playful, too volatile, and too much
smitten by the allure of pure ideas to build
or to lead a vanguard party.
His political life became
an erratic succession of alliances, each
one enthusiastically pursued for a few years,
then angrily abandoned, with his erstwhile
confederates anathematized, though unlike
Rand he would sometimes team up with them
again later, old differences forgiven if
not forgotten.
"Austrian economics and freedom are not synonymous." -JAlanKatz