"It was actually a CIA airstrike in Yemen, and the targets, Anwar al-Awlaki and Samir Khan, were unlawful enemy combatants who happened to be U.S. citizens by accident of birth."
Theirs was citizenship by accident of birth. Which doesn't count.
So to hell with 'em.
Food for thought for Mr. Taranto:
"However imperfect due process, it has a protective faculty which cannot be removed without destroying it. It is the natural enemy and the unyielding foe of tyranny, whether popular or otherwise. As long as due process subsists, courts will put in despotism's path a resistance, more or less generous, but which always serves to contain it."
-- Benjamin Constant, Principles of Politics Applicable to All Governments, 1815 - -