Because facts do not in themselves disclose values, which have to be assumed in order to interpret facts as having a moral valence.Originally Posted by Paschendale
I watched a Ted Talk by Sam Harris in which he made a similar claim about religion and its treatment of women. While his claim seemed to be that facts alone gave us a basis for morality, he had to constantly refer to what causes "human flourishing" and "human suffering"--as if it were also a fact that these aren't values, but are rather found in some natural law somewhere.
Now, to be clear, I more or less agree with the values he seemed to advocate (though I can think of some counter-examples). That's not the point, however: the values must be present in order for the rest of the argument to work, and those values are not in the world, but rather, a product of human intention.