I taught a course last month in the United Arab Emirates, which isn’t a democracy. But according to an Emirati guy I met there, the United States isn’t much of a democracy, either.

“Anyone you don’t like, you just assassinate him with a drone,” he told me. “Shoot first, ask questions later.”

But now lots of people are asking questions about U.S. drone strikes, especially after the recent confirmation hearings for John O. Brennan. Nominated by President Barack Obama to direct the Central Intelligence Agency, Brennan defended the CIA’s targeted killings in Pakistan, Yemen and elsewhere as essential to national security....