Obliviating the whole of Hermione's existence seems counterproductively difficult: She lived in Muggle Britain for 11 years. Are they going to Obliviate all the neighbours and relatives who remember her and might ask casually how she is doing at school? As for Obliviating the memory that she's dead, then why tell them in the first place? It is not clear what sort of memory eradication could be usefully applied. Maybe a False Memory of her dying in some sort of sports accident, rather than being half-eaten? But again, in that case, why tell them the actual truth?
It could easily blow up in their faces, yes.
There's still the possibility that they'll be obliviated of what happened just now, in order to gain time, although that's not quite in character for anyone involved. It'd also blow up - Hermione has a sister, who I don't think has ever been mentioned in Hogwarts.
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 chapters 91 & 92 . The previous thread has passed 500 comments.
There is now 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.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,18,19,20.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: