Yep, he was personal assistant, bodyguard and driver for Osama Bin Laden, but don't let that stop you from supporting him with your amicus brief ...
The guilt by association is not for Hamdan. If he truly did aid Bin Laden, and that is proven in a court of law, then he should be punished.
The guilt-by-association fallacy was in saying that "Al Queda agrees," as though that invalidates my argument. (Although I suspect Al Queda doesn't particularly care whether or not we give them trials. They see themselves as Islamic martyrs. They don't care if they get caught. No, trials are to maintain our own moral superiority.)