> it's just modifying the past

I'm not sure what you mean by this; obviously the "history" of the book is known and not being suppressed. Nobody is denying the origin of the book; if it had been a significant historical artifact, I'm sure the judgment would have been different. "You're destroying history!" is a common refrain when Jim Crow-era statues commemorating confederate generals are removed, or when, e.g., the name of a military base is changed. This does not mean that history is being destroyed! Anyone is still welcome to learn anything they want about these historical figures & events.