First off, kudos to your opening post. ^_^
On principle, I would prefer to take criminals or terrorists alive for the sake of a fair trial, if not the great public relations boost it would provide. This was part of the reason why I had lamented on Serious Discussion that Osama bin Laden was killed in the Pakistani raid; I understood that DEVGRU likely had little choice in the matter because they're trained to kill if there is an imminent threat towards themselves and
should kill if that's the case, but I had been mildly discouraged to see that Americans were cheering about it, happy that someone had died instead of them being brought to justice.
But what I mentioned above was public perception, not the actions of the U.S. government, and my own opinion on the matter. The truth was that the killing of Osama bin Laden should raise far less eyebrows than the fact that the U.S. had violated the sovereignty of a foreign nation, an
allied nation at that. Their borders, integrity, and sovereignty was disrespected, and the U.S. moved in as if their territory was their playground. This would be no different if Pakistan launched a strike team into the U.S. without ever telling Washington. But the justification given is that we are in a war against terrorism, which calls for extreme measures against a less tangible enemy that we've been prepared to counter over the centuries.
The problem with the Constitution was that its drafters could not have possibly imagined what our time would be like. Their weapon of a day was a single-fire musket that took twenty seconds to aim, fire, and reload; they could never have anticipated the days of suicide vests, IEDs, Boeing commercial jets, dirty bombs, biochemical weapons. They may or may not have anticipated that the massive discrepancy of strengths between nations would eventually generate a prevalence of terrorism that smaller countries employ against larger ones. As such, I'm not sure the Constitution remains the absolute best ethical guide by which we should conduct the war if the U.S. is truly committed to "winning" the War on Terror.
So, that said, I actually really am not bothered by Anwar al-Awlaki's death - given that he wasn't just making videos on YouTube, but also
having ties with various attempts at terror plots, even if they constantly kept failing - than I am by the fact that Washington cleared Predator drones over Yemeni airspace without any cooperation from the Yemeni government. Drones have consistently been America's "screw you" asset for the last few years, and while I understand that what happened was safer than sending another DEVGRU team into Yemeni territory, I'm far more interested in discussing the ethics of sending UAVs into foreign territory than I am of al-Awlaki's death.
EDIT: Oh, and I voted "it's a tricky issue". ^_^;