Lucius not even hearing about the attacks is an interesting idea! And I'm sure Dumbledore would be more skilled at intercepting mail than Filch and Umbridge. Hm, now I wonder what other points in the series might make more sense if Dumbledore pulled a Dobby and stole some mail.
But I think it also works if Lucius sincerely believes the diary will basically Imperius its user into cursing other students only according to criteria set by the diary-curse: that is, the diary makes the user attack only people they know to be half-bloods or Muggle-borns. Everyone knows Draco is spotlessly pureblooded, so he's safe. Ginny will eventually be caught with a cursed diary with all the great (for Lucius) political consequences of that. I could believe that Lucius does think it would work this way. After all, if the cursed object makes its victim fake an "Heir of Slytherin" campaign to purge the school of non-purebloods, obviously the curse will make sure the victim really does only attack non-purebloods to make it convincing, right?
Also an interesting idea about secrecy spells! We know they have spells to make people not notice physical objects, like the Knight Bus. And of course there's the confusing Fidelius Charm which never seems to work the same way twice. Other information-concealing spells seems plausible. Your idea of a spell that prevents people from connecting dots sounds promising. They can learn the information if it's right in front of them, and maybe could figure it out if they were really determined, but otherwise just... don't think about it. The whole idea kind of slides out of everyone's awareness. That kind of tampering would be hard to detect, and so should work pretty well.
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timeasmymeasure
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Date: 2021-06-19 12:14 am (UTC)But I think it also works if Lucius sincerely believes the diary will basically Imperius its user into cursing other students only according to criteria set by the diary-curse: that is, the diary makes the user attack only people they know to be half-bloods or Muggle-borns. Everyone knows Draco is spotlessly pureblooded, so he's safe. Ginny will eventually be caught with a cursed diary with all the great (for Lucius) political consequences of that. I could believe that Lucius does think it would work this way. After all, if the cursed object makes its victim fake an "Heir of Slytherin" campaign to purge the school of non-purebloods, obviously the curse will make sure the victim really does only attack non-purebloods to make it convincing, right?
Also an interesting idea about secrecy spells! We know they have spells to make people not notice physical objects, like the Knight Bus. And of course there's the confusing Fidelius Charm which never seems to work the same way twice. Other information-concealing spells seems plausible. Your idea of a spell that prevents people from connecting dots sounds promising. They can learn the information if it's right in front of them, and maybe could figure it out if they were really determined, but otherwise just... don't think about it. The whole idea kind of slides out of everyone's awareness. That kind of tampering would be hard to detect, and so should work pretty well.