3g: Several places in the Qur'an assume the existence of slavery, particularly the enslavement of prisoners of war. (Thus the first punishment for killing a believer accidentally is to free a believing slave. And there are several verses permitting a -- male -- Muslim to have sex with a slave.) Yet, today, slavery is viewed as barbaric, inhuman, and something that humanity has 'put behind itself." How do you reconcile or accept this?