Obama Secretary of State John Kerry, in his famous Winter Solider remarks to Congress about the Vietnam War:
... it seems the Government of this country is more concerned with the legality of where men sleep than it is with the legality of where they drop bombs.
these [drone] strikes are legal, they are ethical, and they are wise
Remember, Jay Carney is talking about the President's claimed right to bomb US citizens, as well as anyone else he thinks (but can't necessarily prove in a court) might kind of sort of have something to do with a terrorist group. And civilian casualties, so much a part of Kerry's concerns back in the 1970's? They are just asking for it.
Anyway, I have not had a chance to digest the Administration's white paper on targeted killing (I can't even believe I am writing that phrase -- our Constitution specifically banned bills of attainder but now the executive claims the ability to kill at whim). Jacob Sullum has some thoughts at the link. I will write more if and when I have a chance to read it, but I am sure I will find it horrifying.