I was never bothered about killing an Al Qaeda leader who was enthusiastically committed to terrorism against innocent Americans. The fact that he was an American citizen (by dual citizenship) is irrelevant. He was a traitor by definition, and he got what he deserved, in a war that Al Qaeda started.

As an American citizen, if you choose to wage war against America, you lose out on the protections of American courts, and you get to deal with the military, instead.