There are more sophisticated variants which allow us to say, without invoking a fact value divide, that slavery is not wicked regardless of social circumstances. Rawls, for example, thinks that justice only applies in relative rich societies; his later views are even more relativized than that.
Btw my intuitive counterexample to utilitarianism is not refuted by invoking your Marx style moral relativism. I need not be committed to an ahistorical meta-ethics under which slavery is never justified under any circumstances. If utilitarianism allows for slavery under modern circumstances, and I think it does, or explains what's wrong with it in the wrong terms, then the objection stands even if slavery is acceptable outside what Rawls calls the circumstances of justice.
I published a paper related to this long ago, send it to you if you like.
--- On Sun, 12/14/08, Shane Mage <shmage at pipeline.com> wrote:
> From: Shane Mage <shmage at pipeline.com>
> Subject: Re: [lbo-talk] Catholicism, was Re: blacks about as morally conservative as Republicans
> To: lbo-talk at lbo-talk.org
> Date: Sunday, December 14, 2008, 8:12 AM
> On Dec 13, 2008, at 11:59 PM, andie nachgeborenen wrote:
>
> > Of course intuitions, beliefs and values are social
> products of various modes of production. Your point is?
>
>
> That they cannot legitimately be used to make any judgments
> transcending the peculiar epoch of historical development in
> which they flourish, such as "slavery is wicked,
> period." What does transcend peculiar epochs of
> historical development are the rational structures of the
> sciences, including philosophy, because they sum up the
> development of objective human reason from its inception
> through whatever time happens to be the "present."
>
> Shane Mage
>
> > This cosmos did none of gods or men make, but it
> > always was and is and shall be: an everlasting fire,
> > kindling in measures and going out in measures."
> >
> > Herakleitos of Ephesos
>
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