Hmm...a few thoughts.
I’d always read this series as Rationalist propoganda, and this chapter doesn’t really work in that light.
Dumbledore, I’d figured, represented the world’s Conventional Wisdom. Benevolent, on the whole, deranged, absolutely, and far more powerful than Harry could ever be. Harry and Co. can no more overcome him than the LW’s readership can defeat the billions of non-rationalists.
With that interpretation in mind I didn’t really doubt that Dumbledore could ever be guilty of something, but figured Harry would have to let him off the hook. People with good intentions do bad things but you can’t go all Steerpike, ya know? I sort of figured that this was confirmed in Harry’s speech to McGonagall about blaming Voldemort vs. himself. Heroic responsibility means save even those who have erred (and I can’t really conceive of Dumbledore/humanity being judged to have sinned save by error).
But now we have Harry teaming up with Lucius and Draco, ostensibly to take down Dumbledore. I figured Draco represented your smart friend that you are trying to get to be a rationalist, and Lucius their peer structure. Inducting them into the Conspiracy shouldn’t allow you to overcome the deranged and benevolent Majority.
I suspect that Harry is securing their agreement to investigate Dumbledore while, himself, believing Dumbledore will be shown to be free of malice. Basically the blood purity science experiment all over again. I figure his goal here is to bring them into alliance, just as he says to Draco. Once the Malfoys abandon Blood Purity there is no reason they can’t be allies to the Dumbeldore power structure, save for both side’s past sins. Harry is drawing Lucius and Draco into investigating one of these sings in the hopes of effectively explaining it away, which coupled with their renunciation of Blood Purity as a doctrine should allow the formation of an alliance.
Also, I’d like to add that its hilarious to watch all the characters try and figure out who HARRY’s enemy is. They’ve been listening to Dumbledore’s ‘Life Is A Story’ pitch a bit too much. If someone tries to have a girl sent to a hell dungeon and then has her eaten by a troll they don’t like her. They aren’t trying to impede the Hero’s Quest by Sundering his Fellowship, they are acting out their animus. I predict that Hermione’s framing and murder were about her, not Harry.
Thanks for reading this long comment
Thales of Miletus (the so-called ‘Father of Science’) seems to be the first philosopher of the Greek tradition.
Now, obviously, he was wrong about nearly everything, but the leap from being silent to being wrong may have been humanity’s greatest step towards being more true.