Yes, it indicates this is wrong. There's a profound difference between killing someone in the heat of battle versus the president reviewing kill lists every Tuesday. The latter suggests a lack of imminence. Add to that he's a citizen and that the battlefield is any place where "terror" is.
Arguably, al-Awlaki simply preached dissent. Granted, you can argue he was a traitor actively trying to harm the US. In that case, so is Hammond, and a lot of other people conveniently on official lists.
Just because you disagree, even vehemently, with al-Awlaki's message, does not mean that we should compromise our principles of due process. Larry Flynt wasn't an ideal poster boy for free speech advocates. But his justice affirmed the strength of the 1st Amendment and was a small step in erasing racial boundaries (he published interracial porn shortly before being tried on obscenity). So I think lumping al-Awlaki and Hammond together is very much productive.