Conscious control over social presentation is a learned skill; it doesn't come in the same box with intelligence or rationality, although either or both might make it easier to pick up. I suspect it's prominent in Methods mainly because it serves the particular type of wheels-within-wheels plotting that Eliezer seems fond of.
We could have a conversation at this point about whether constructed social presentation is unethical or "creepy", but I don't think it'd get us anywhere. Some people have the squick response, some don't.
(Incidentally, I don't feel like Snape's got this in-story. He's certainly got a facade, but it's the sort you build semi-involuntarily when you hate parts of yourself and desperately want to hide them, not the kind you consciously build to optimize social outcomes. Harry does have it, but shouldn't have had the opportunity to develop it; it may be part of his Mysterious Dark Side/possible Harrymort package.)
For Snape, I was specifically thinking of the scene in Dumbledore's office where Harry reveals that he knows about the prophecy and Snape reacts without hesitation as though he hadn't heard of it. Snape was also a double agent during the war, and continues to maintain close relationships with Dumbledore and Lucius Malfoy. His actions do seem crude, awkward, uncontrolled or mostly defensive in other scenes such as in the bullying arc or his conversation with Quirrell in the forbidden forest in Chapter 77. But then, one can act with false impulsiveness too.
I suppose the characters are in a cold war and in the shadow of a hot war. That circumstance makes "offensive" deception in one's social presentation more useful.
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 97. The previous thread is at nearly 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, 21, 22, 23, 24, 25.
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: