Accusations in Parseltongue are not true, the speaker merely believes them. (Actually, this raises the possibility of lying using a confundus charm. I'll assume that's banned by some Rule). If you were trying to mitigate the chance of someone destroying the world, you place a very high probability on them trying to trick you. The response is to use Hermione's algorithm that defeated LV earlier and place an ethical injunction on not killing Harry.
Now, that's probably a little harsh for the exam question, and LV won't necessarily adopt his enemy's tactic (even though it defeated him once and that's one of his rules), but I should think he requires substantial evidence to not kill Harry. More than an accusation of not being ambitious, which is explained by Harry's naivety.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 113.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
IMPORTANT -- From the end of chapter 113: