You mentioned in another post about Dumbledore's "protection" being seriously lacking (for people like James & Lily). Can you expand on this?
I suppose it's time.
What the Fidelius Charm Does
The Fidelius Charm involves three parties: a location to be protected, a secret keeper, and the caster of the charm. Upon completion, a location is perfectly hidden. It can't be accessed physically even if someone knows it must be there (e.g. Grimmauld Place disappearing between numbers 12 and 14 with no explanation of the missing building in between), cannot be plotted by wizards, and can't be accessed magically either.
To enter the location and even be able to access it properly, a person needs access to 'the secret' which is granted by only the secret keeper. Through this person, they then have access to the location on a full-time basis (it is not a one-time ticket and seemingly cannot be revoked).
Those who are not granted 'the secret' cannot enter the location no matter what they might try. This makes it, on the surface, a highly dependable security measure.
Alright, What's the Problem
There's a few problems right away with the spell.
The first is the known one from canon, it relies on a 'secret keeper'. A party has to be trusted to grant access to the location. If this is a third party, they have to be able to reliably white list those seeking entrance and cannot afford to make a mistake. If this party is compromised or is nefarious then the charm is rendered completely void with no warning to those being protected or the caster.
The second is that, upon the secret keeper's death, there's no next in line but the secret instead defaults to being kept by everyone on the whitelist. In canon we see this with the death of Dumbledore (secret keeper for Grimmauld Place). Upon his death, everyone now has the ability to give access to Grimmauld Place. This includes Severus Snape who is a presumed Death Eater, meaning that Grimmauld Place is now completely compromised. This is very very bad.
The third is part of the above, once you're on the whitelist it seems you can't be removed. They discover Severus Snape is a Death Eater, Dumbledore dies and everyone's now secret keeper, they can't seem to revoke both secret keeper status as well as his presence on the whitelist from him. The best they can do is set up a hilariously terrible jinx to protect the building if he tries to enter (it is uh very ineffective).
The fourth is that your status on the whitelist never expires. Once you're in, you're in forever. You don't get just a one-time pass or a session with an expiration date where you have to reapply for access. Now, perhaps this is convenient as it means you don't have to seek out the secret keeper again (and in that sense secures the secret keeper's identity) however it means those who might have flipped sides later have access forever or else people now always have access to the location even in unwanted hours/if they were there for just a meeting.
These are just the weaknesses baked into the spell by nature, it gets worse when we consider how it's implemented for Godric's Hollow.
Alright, What's Wrong with the Godric's Hollow Implementation
This is where things start to look nefarious.
The above, I wouldn't expect wizards to necessarily be thinking about. While at this point asymmetric key encryption is taking off in the Muggle world and has been for decades, it's a recent Muggle invention and not one that even ordinary Muggles pay attention to let alone wizards (who would then have to consider how to implement this in a magical form and what use cases it'd have for them). What the wizards employ, while bad, is not out of line with how ciphers and things worked for much of Muggle history. You have a key you have to protect, if you lose it you're fucked, no way around that. Which means that passing the key to those who need it, making sure you can trust them, is the largest weakness of the system. The Fidelius is very strong in that it seems you have to have the key to break it, which is the case with all encryption, and the issue then is trying to keep the key as safe as possible (which is always a hard task).
Basically, looking at that, I don't think they could have done much better than the fidelius in terms of security in and of itself (there's other options they could have taken but we'll get into that below).
But then we look at Godric's Hollow.
The issue is who do they make secret keeper. They suspect Lupin of being a spy, someone has been leaking information to Voldemort including the Potter's location (which is why they had to go under Fidelius in the first place). At this point, they're already fucked.
They try to get around this by announcing the secret keeper is Sirius but in secret making it Peter, so that everyone will go after Sirius instead. The trouble is that James only has three friends. One he thinks is a spy, that leaves two.
Even had Peter not been a Death Eater, Peter knew who the secret keeper was. If you know who the secret keeper is, that's effectively knowing the secret itself. All Voldemort has to do is find the first person among the Order who will either talk, or slowly pick his way through Potter's associates and friends until he gets the secret or else kills the one who turned out to be the secret keeper.
Not to mention that all Voldemort has to do is imperio those who have access to the secret and send them to murder the Potters in his stead.
Sirius, Peter, and Remus would be the first on Voldemort's list, and everyone knew that.
It would have been a matter of weeks, had Voldemort actively pursued this, before Voldemort gained access to the house.
And here's the thing. We see that Dumbledore can be both the caster and the secret keeper from Grimmauld Place. Dumbledore, reportedly, is the only person Voldemort is scared of and is the strongest wizard by far in the Order. Why didn't Dumbledore offer to be secret keeper? Why didn't he insist on it? Why didn't James and Lily ask him to do it, especially when they suspect Remus of being a spy?
While James might have picked Peter out of a show of loyalty, Dumbledore could have insisted for their protection. Instead, it seems like Dumbledore purposefully let them take this option and never gave an explanation as to why.
Maybe, Godric's Hollow Was a House of Cards
We also have James. James, canonically, snuck out of Godric's Hollow while it was under protection to hang out with Sirius and the gang. Dumbledore confiscated his invisibility cloak for this reason, something Lily notes in her letter to Sirius.
The thing is, while Dumbledore takes the cloak, that's the only thing he does to stop James from sneaking out. Perhaps it's not his place to do more, but on the other hand, this does nothing to stop James from sneaking out and James (having access to the secret) could easily be imperioed and sent back to murder his family.
Instead, he makes it look as if he's doing something, but is taking an item he greatly wanted as it is.
With that prophecy, where Harry or Neville are the only ones capable of defeating Voldemort, it's starting to look like Dumbledore wants James and Lily to be found. He wants to set up just enough protection that, at a glance, it looks very secure and as if they're putting their all into hiding them: except that he doesn't want it to hold.
Godric's Hollow is a trap intended for Tom, to lure him into a confrontation with the child, when he's the only one who knows the full prophecy and the last few lines that Tom doesn't (as it is, I'm not sure even we the readers know exactly what the prophecy says or that Snape learning the prophecy wasn't a set up).
My theory is this: Dumbledore purposefully chose this method of protection (versus sending Lily and James out of the country with Harry), purposefully chose not to be secret keeper, and set up Godric's Hollow as a means to lure Voldemort into a trap and vanquish him with James, Lily, and Harry as unfortunate collateral damage.
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Beater's bat
Written for @hinnymicrofic, January prompt 15: Pick
“No!” Lily Luna let out. “I want to be a Beater this time!” She was on the edge of her fake crocodile tears to get her way. “You promised.”
Hugo’s eyes widened.
“Lily, you are the size of a bowtruckle!” James argued. “What makes you think you can be a good Beater?”
Half the adults groaned at the kids’ row. Ginny facepalmed herself.
Lily’s cute little face turned murderous as she bent down and picked up the Beater’s bat.
Immediately all the adults shot off their seats. “No!”
Lily swung back but then the bat soared up, levitated by Harry. He walked up to her and caught the bat.
“Lily, we do not ever swing the bat at brothers—or cousins. I know you want to play Quidditch, and you can, but that is not how we win an argument. We use our words.”
“They don’t listen to me!”
He could see the tears threatening to spill now were real, angry tears. He stood up. “I’ll pick the teams.”
James groaned.
“If you don’t agree, you don’t have to join,” Harry told him. James shut up.
Harry divided the teams and though they didn’t seem too happy, they agreed. He bent down to Lily’s eye level and gave her the bat back. “If I see you aiming that at anything but a bludger, you will not see a broom for a month.”
Lily innocently met his eyes. “Why? Is mum going to fly her game without one?”
Harry had to try hard to bite back his smile. He wasn’t sure who Lily had inherited her snark from, but it would be the death of him—and his parenting—one day. “Lily, don’t test me. You will not sit on a broom for a month.”
Lily nodded, pretending nothing had happened. “Okay.” She skipped to her broom, the bat swinging in her tiny hand.
He looked over at Ginny, who gave him a hidden thumbs up. He shook his head and walked back to his chair, eager to get started on his lemonade.
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