Why the Xykon "power" speech is great

[hroþila]

Personally, I think they didn't need V to quite believe it, all they needed was a millisecond of "But then it wouldn't be me doing it!" for the rationalization to crack, whether or not V realized later that the suggested plan wouldn't work. But given V's state of exhaustion and distress, V might well have believed, at least until they stopped to think it through, long after losing the splice.