The Human Question

Question: could we have evolved so as to look on genocide with approbation?  If so then our disapproval thereof is more of a kind of distaste. If we couldn't have evolved thus, then the disapproval has an objective basis.  Which basis is.....?

When Sam Harris debated Bill Craig, he ignored BC's arguments and talked on and on about the Old Testament. A theist could do something similar in a debate... just point to the racist things that Charles Darwin said in the Descent of Man and ask on what basis one would disavow CD.