Bin Laden is not an American - he is not ensured the rights of the Constitution.
Awlaki could have had his citizenship revoked or been tried and found guilty in absentia.
Awlaki, as far as I’m concerned, forfeited his citizenship when he became a traitor. Thus, while it would have been better to capture him and obtain intelligence (if that was a real option), I have zero problem with his being killed in a military strike. No tears shed here. Any other American who has become (or becomes) a traitor to their country deserves the same fate.