Justin clearly hates Nathaniel Hawthorne, which, I absolutely sympathize with, but he told Magnus to erase Nathaniel’s Hawthorne’s works in character. This means Taako, who seems to have a spotty formal education and a more magical and historical bent to the knowledge he does have, at one point canonically read and hated a D&D version of Nathaniel Hawthorne.
Or perhaps it’s a more ideological hatred. Real Life Nathan H was not super likeable. He loved morality tales, couldn’t stop using allegory if his life depended on it, and had a fixation on the Puritan past of New England. Going along with that was a fascination on the Salem witchcraft trials that stemmed from Nathaniel Hawthorne’s own family past. Accusations of witchcraft and sin, true and false, abound in his books. Now, that’s one thing in a world where magic isn’t real. It’s totally different when people can and will give you a Mage Hand wedgie if you make fun of their pointy hats.
Taako probably made it three pages into The House of The Seven Gables, got bored, flipped around, realized it was wildly prejudiced against magic users, and decided someone needed to Magic Missile this dead, crumbly, loser. Just because you don’t have superpowers doesn’t mean you get to be rude to people who do! Honestly, how’d this sort of stuff even end up in a library. Erasing the real history of anti-wizard sentiment and writing some boring story about sad people in an old house coping with the “trauma” of having an ancestor who was a total jerk is just stupid. Lup, come look at this garbage! How do you not know if you have a curse? You just ask someone to come around and have a look at it. That’s what trainee mages are for.