How Obama went from reluctant warrior to drone champion

When it comes to questions of war and peace, it often seems as if there are two Barack Obamas.

There’s the president who has anguished, often publicly, over the morality of killing and the costs of combat.

“No matter how justified, war promises human tragedy,” Obama said just days after his 2009 decision to send 30,000 U.S. troops to Afghanistan.

Then there’s the president who, over the last seven years, has…