Harry Potter books with a huge amount of rationalist self insert. Harry can be a little insufferable sometimes, but I still found the books pretty enjoyable. The core message, is the idea of suffering, unlimited suffering - represented by death, dementors, and Azkaban. Similar to Unsong in this - both draw from rationalism.
HPMOR’s representation of it focuses more on the humans being okay and even endorsing Azkaban - how much it’s been normalized - similar to the concept of death itself. It tries to show how ridiculous this is.