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Quote by: Fangrim  Of course, that person would have to prove that that moral standard is, in fact, universal, or at least that it "should" be. |
What do you mean by "universal"? That all humans actually have it as a moral standard? That all conscious beings in the universe have it? That would be pretty hard to prove. Again, you are mixing up the normative and the positive. What is moral is not necessarily how things are, or how people think they should be.
A moral standard that is universal is a pretty boring moral standard; if everyone truly agrees with it then no one will violate it.
Is your argument that there are no moral universals? Ok, why not just say that then? If you mean slavery specifically is not immoral, then make an arguments about slavery in particular.