Quirrell values Harry - at least instrumentally, for purposes as yet uncertain, and possibly emotionally (if he is capable of valuing a person in that way). He is too valuable to kill except as a last resort, and Quirrell's actions suggest that he thinks he can avert the prophecy and make the killing unnecessary (otherwise he would not be taking all the measures he is currently taking).
As for not informing others of the prophecy, doubtless he feels that whatever (frantic and desperate) actions they might take in response would interfere with his own much more intelligent attempt to resolve the situation.
That's fair enough, but I just thought of one more thing that Quirrell could do that he's choosing not to... Why isn't Quirrell doing the star thing again, or at least offering to do so?
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: