[Nasrudith]

Those two are completely different sins - even putting aside that "cancel culture" as a term is about whose ox is gored. Fire a teacher for once having done porn in college or expel a student because their mother works as a stripper and they call it "community standards". Or for approving of gay marriage back in the 80s or 90s. But when they get fired for wearing blackface, or supporting literal genocide suddently it is cancel culture out of control. Their complaints aren't that the game is fucked up but that they aren't winning anymore.

Judging the past by the standards of today may be fallacious (said complaints ignore contemparies pointing out how fucked up it was meaning the ideas certainly were conceivable) but it is discrediting and not the erasure of knowledge of book burning.