You don't have to condescend to me. On what principle(s) was al-Awlaki subject to anything other than ordinary criminal due process?
Al Awalki was in a foreign country--where U.S. criminal laws presumptively do not apply--organizing armed action by foreigners against the United States. It's an archetypal act of war, rather than a crime.
But even so, why ask me? You're a lawyer, you know how to provide extraordinary evidence to support extraordinary claims relevant to what is by no means a settled question.