Charles Krauthammer‘s latest column examines the president’s reliance on drone warfare.

The Osama-slayer card having been vastly overplayed, what to do? A new card: Obama, drone warrior, steely and solitary, delivering death with cool dispatch to the rest of the al-Qaeda depth chart.

So the peacemaker, Nobel laureate, nuclear disarmer, apologizer to the world for America’s having lost its moral way when it harshly interrogated the very people Obama now kills has become — just in time for the 2012 campaign — Zeus the Avenger, smiting by lightning strike.

A rather strange ethics. You go around the world preening about how America has turned a new moral page by electing a president profoundly offended by George W. Bush’s belligerence and prisoner maltreatment, and now you’re ostentatiously telling the world that you personally play judge, jury, and executioner to unseen combatants of your choosing, and whatever innocents happen to be in their company.

This is not to argue against drone attacks. In principle, they are fully justified. No quarter need be given to terrorists who wear civilian clothes, hide among civilians, and target civilians indiscriminately. But it is to question the moral amnesia of those whose delicate sensibilities were offended by the Bush methods that kept America safe for a decade — and who now embrace Obama’s campaign of assassination by remote control.