I would not give Zacarias Moussaoui the death penalty, because this is what he wants. He thinks of himself as some sort of a "martyr", and that his death at the hands of infidels will bring him the heavenly rewards he expects. It is worth remembering that islamofascism is a death cult - these "people" worship and seek death, and have repeatedly stated their contempt for the "love of life" prevalent in the West, which, in their twisted minds, is a weakness.
Therefore, a death penalty would not be a penalty for Moussaoui. I would throw him in prison, let him grow old in there, watching his side lose and be thrown into the trash bin of history, while the enemy he hates grows in strength and prospers. "Good life is the best revenge", as someone brilliantly said.
There is also the sliver of a chance - really, really tiny, I know - that he may one day be granted a horrifying glimpse into the nature of evil he helped commit, and be tormented by guilt for the rest of his days. Obviously, the chance of that happening is ridiculously tiny, so if it were the only thing, I'd say, kill the bastard. But the possibility that he will be eaten alive by his unfulfilled hatred is real. So let̢۪s not give him the easy way out.

