Quirrel squished Rita of his own accord for his own purposes and Harry's presence there is damn near irrelevant.
Kinda-sort of.
Harry inadvertently gave Fred&George the idea of making up rumours about Quirrel (by telling them he doesn't like rumours, and asking them to leave Quirrel out of it). Which Rita Skeeter published.
And the prank he actually commissioned gave Quirrel a plausible explanation for Rita Skeeter's disappearance.
Morally Harry is not really responsible IMO. But causally, eh... her death would have probably not have happened if he hadn't talked to the Weasley twins about her.
Morally he still deliberately ruined her, regardless of whether he thought it would cause her death. Doing something to ruin the reputation of someone who lives by their reputation is morally bad even if you didn't think through all the consequences.
--edited for language and clarity.
The next discussion thread is here.
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 85. The previous thread has long passed 500 comments. Comment in the 15th thread until you read chapter 85.
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.
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