But in Hebrew scripture David is not just the “sweet singer of Israel,” the chiseled poet who plays a harp and composes the Psalms. After he makes his name by killing Goliath, David recruits a gang of guerrillas, extorts wealth from his fellow citizens at sword point, and fights as a mercenary for the Philistines. These achievements make Saul jealous: the women in his court are singing, “Saul has killed by the thousands, but David by the tens of thousands.” So Saul plots to have him assassinated.19 David narrowly escapes before staging a successful coup. When David becomes king, he keeps up his hard-earned reputation for killing by the tens of thousands. After his general Job “wasted the country of the children of Amman,” David “brought out the people that were in it, and cut them with saws, and with harrows of iron, and with axes.” 20 Finally he manages to do something that God considers immoral: he orders a census. To punish David for this lapse, God kills seventy thousand of his citizens.

The Better Angels of Our Nature: Why Violence Has Declined