High marks for out of context quote
The point is, if you are an enemy combatant of the state, proven by your actions, you should forfeit your rights as a citizen and the protection under the law citizenship affords.
Jihadi John is a case in point. He butchered Englishmen for the Islamic State. Was he not then fair game for elimination? As a pacifist (believe it or not), ideally such characters would be captured, returned home and made to stand trial, but if there is a continuing threat from such men to continue to murder combatants, and, more egregiously, non-combatants, then they should be targeted.
But better yet, I believe, (believe it or not) that this wouldn't even be an issue if we just stayed the **** out of the Middle East.