Perhaps if we can't offer proper justice, I suggest we let the Northern Alliance put him on trial instead. Given the fact that he threw away his American citizenship, that is *exactly* what should be done. If they want to let him go - hey, it's their choice. He can't come here again, though. If they want to play the headless-goat game with his carcass, that's okay, too.
My point of view is that Walker will never, ever really feel like a free man. If and when he gets out of prison, he will constantly have to look over his shoulder to ensure his own safety (assuming he stays in America).