William_Quixote comments on Harry Potter and the Methods of Rationality discussion thread, part 21, chapters 91 & 92 - Less Wrong
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Just noticed this creepy detail:
Madam Pomfrey is in charge of the medical ward, so the Grangers are not going home, they are going to a hospital.
Harry from the prior chapter to his parents who still have a living child to give them this warning.
Or, perhaps, Madam Pomfrey is taking them to see the body, since it is in her medical ward.
It sounds like they're either having medical issues due to stress, or they're going to where Hermione is being kept. If they were to be obliviated, I'm sure it would be in their own home.
Obliviating the whole of Hermione's existence seems counterproductively difficult: She lived in Muggle Britain for 11 years. Are they going to Obliviate all the neighbours and relatives who remember her and might ask casually how she is doing at school? As for Obliviating the memory that she's dead, then why tell them in the first place? It is not clear what sort of memory eradication could be usefully applied. Maybe a False Memory of her dying in some sort of sports accident, rather than being half-eaten? But again, in that case, why tell them the actual truth?
This happened in Canon, and was done by Hermione herself, albeit in her I think 6th or 7th year.
Hermione didn't erase her own existence, but implanted false memories to get her parents to go to Australia. Distance did what magic couldn't.
Actually, she did both of those things. And, incidentally, it's the false memories bit that would be impossible in Methods - Hermione, of course, did not spend years to give her parents what are apparently years worth of memories.
It's only perfect, undetectable Memory Charms that require that much time. Giving someone years of memories in the quality that is customary for years-old memories, when no Wizard has anything against it, is probably not that difficult.
Well. I stand by the criticism. Either Hermione, or Rowling, wasn't thinking things through.
Well, in Hermione's case, she may not wanted to give her parents that level of grief. Although frankly, I'd rather remember a loved one who I think died then not remember them at all, and I suspect that Hermione would think the same way. So canon Hermione likely didn't really think this through. (Frankly, the first time I read what she did to her parents, I was absolutely appalled- I don't think Rowling really appreciates how absolutely insidious and violating memory modification is.)
I distantly recall that canon!Hermione was trying to remove her parents as potential hostages / revenge targets. I think the goal was to get them to Australia without violating the Statute of Secrecy. This doesn't make sense, now that I think about it - her parents already knew she was a witch, why is telling them about the war a violation of secrecy. Updating towards my memory being wrong.
Even assuming my memory is right, I agree with you that Rowling's reasoning is disturbing. There are so many other ways to protect the information in canon (eg Fidelius), yet Rowling picks the least consensual, least possible to give informed consent method.
I suspect this is because they wouldn't voluntarily abandon their daughter, this was her way of pulling a more hero than thou on them.
That is extremely creepy.
On the other hand,
My interpretation is that Madam Pomfrey is a trustworthy staff member, while at the same time being inconsequential enough that her time can be spent on escorting Muggles around. She is also used to dealing with horrified parents, and therefore a good first point of contact for the Grangers.
That makes sense, its possible I'm being paranoid, but when people with inconvenient memories get taken to hospitals it does make me worry.
What I'm wondering is more why Harry doesn't push for his parents to be temporarily obliviated of his own existence, as a mean to protect them.
Hermione did it in canon at the beginning of the Deathly Hallows, and that was a very sensible thing to do, and it told a lot about Hermione for her to cast that spell.
And yes, it's very creepy, this "Obliviate !" scene in Deathly Hallows almost made me cry (both in book and in movie), it was the saddest scene of the 7 books to me. (And yeah, I know, I should be more sad about the people who actually died...), but Harry definitely is rationalist enough to force himself to do something as painful as that if it's to save his parents.
This was a bad idea in canon and will be an even worse idea here where obliviations are permanent.
Actually, they were pseudo-permanent in canon too. It seems like the caster of a Memory Charm can revoke it, but nobody else.