Did anyone actually read The Killing Joke? ("One Bad Day" Rant)

Everyone always harps over the "One Bad Day" thing, COMPLETELY ignoring the ENTIRE FUCKING PLOT OF THE BOOK. The Joker nearly killed Jim Gordons daughter, crippled her, stripped her and took photos of her to show to Jim later on when he kidnapps and tortures him. And yet Jim does not go crazy. He does not break. His bad day came, and he stood still. But the main discourse about the Joker isn't how he is plainly wrong, it's how one bad day is all it takes to drive a man insane? What? That's literally the opposite message of the book, lmao. The book is more about hope and internal integrity than edgy quotes and ha ha ha and 'oooh, did Batman just kill the Joker?'.