Because it's hard to be seen as on the light side when you decapitate 38 adult wizards in an instant? Fame is harmful, not helpful, to Harry's goals. Better to make it look like Voldemort managed to cause a magical backfire that killed all his minions in a failed ritual involving Hermione. To go back to the Azkaban chapters, the perfect crime is the one that is declared a tragic accident and closed.
Fame is harmful, not helpful, to Harry's goals.
Is that true? Harry wishes to reform or replace the government of Magical Britain, and being the hero who defeated Voldemort twice would make that a lot easier (as Voldemort himself acknowledged). Turning Hermione into the Girl-Who-Lived dilutes that effect, and also brings all his fame-related problems down upon her.
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 114, and also, as a special case due to the exceptionally close posting times, chapter 115.
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.)