I can’t pin it down to just one, but holy shit school shootings and the way we’ve responded to them completely broke whatever part of me thought that our society was still capable of doing things. They keep upping the ante with how horrifying they are too - the high water mark currently is Uvalde, and I think that the next one that shocks the nation will involve the cops (or a “good guy with a gun”) gunning down multiple kids or parents while trying to “help” and our collective response will still be to do nothing.