loserthree comments on Harry Potter and the Methods of Rationality discussion thread, part 20, chapter 90 - Less Wrong
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On a side note -
"But what I must actually tell you is that you will find the standard introductory text in the north-northwest stacks of the main Hogwarts library, filed under M."
First, I rather appreciate the comic relief, Eliezer.
... But second, what the heck are Memory Charms doing outside the--
Right. Hogwarts. Crazies. Nevermind.
Or Quirrell, who has declared his intention to visit the restricted section, is planning to plant the book for Harry's 'benefit.'
Doubtful. That's not a lie Quirrell can sustain: Harry can ask anyone else what the status of memory charms is in the Hogwarts curriculum.
Wizards in general need memory charms to deal with muggles, so that's a plausible reason they aren't seen as Dark by the wizarding community. There are probably strong cultural taboos against using them on other wizards (as opposed to muggles), in the same way there are strong cultural taboos against using cars to run over pedestrians even though that's a power that many teenagers acquire here in the real world.
I would guess that either
A) He doesn't need to ask a professor, he can just ask a seventh-year.
Good point. I'm sticking to B, Quirrell was telling Harry he'd pass it to him on the downlow. Note that he didn't say that the book would be labeled "Memory Charms," just that it would be filed under M.
Magick Moste Evile? (This is an in-universe book from canon, in case anyone forgot.)
B was my thought - or at least I'd definitely check if I were Harry. But checking every book in the section seems time-consuming and suspicious. I think we should assume there is in fact a standard book on Memory Charms there. Doesn't mean it contains a single truthful word.
Even if truthful, it may not actually say how to cast.
In canon, Hermione casts Obliviate in her 7th year (presumably without consulting a restricted text from the Department of Mysteries), so the widely available book may actually have enough information for an intelligent reader to learn how to cast it.
Well, Draco's taboo against memory charms against half-bloods was roughly as strong as his taboo against violent rape of half-bloods. I'm not sure we should accept his initial taboos as either consistent or typical, though.