Today's post, Is Morality Preference? was originally published on 05 July 2008. A summary (taken from the LW wiki):
A dialogue on the idea that morality is a subset of our desires.
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G.E. Moore is famous for this argument against external world skepticism: "How do I know I have hands?" (he raises his hands in front of his face) "Here! Here are my hands!". His point was that it is absurd to call the more obvious into doubt by means of the less obvious: By whatever means I might understand an argument supporting skepticism about my hands (say, the Boltzmann Brain argument), by those very means I am all the more sure that I do have hands.
I think something similar might apply here. To say that morality is 'objective' or 'subjective' may be an equivocation or category mistake, but if I understand anything, I understand that slavery is wrong. I can't falsify this, or reduce it to some more basic principle because there is nothing more basic, and no possible world in which slavery is right. A world in which the alternative is true cannot be tested for because it is wholly inconceivable.
Further reading: http://en.wikipedia.org/wiki/Here_is_a_hand#Logical_form http://www.overcomingbias.com/2008/01/knowing-your-ar.html http://www.gwern.net/Prediction%20markets#fn41