Somebody call Hell. See what the temperature is down there. Must be getting chilly, because I find myself agreeing with Mookie again.
(BTW: the scariest thing written above is "President Mookie". /shiver)
USC|18|2381 only applies if the person has been convicted of treason.
Al-Awlaki was never charged with a crime in the U.S. As an american citizen, the federal government had no legal basis to order his death, period.
The evidence was voluminous. He could have been tried in abscentia, but that never happened.
For the non-americans here, yes, his being an american citizen vs. non-citizen is very important in U.S. law, as the United States Constitution specifically prohibits the government from acting in this manner, against a citizen, without due process of law.
That being said... ...
Glad he's dead.