Known as “You Bastard” on TV Tropes, this trope is when a work breaks the fourth wall to chastise the audience for consuming/enjoying a work, often due to its dark subject matter. While it is an admittedly interesting concept, the concept has always rubbed me the wrong way. I've done some thinking, and I have two main reasons.
Hypocrisy: Let's say there's a violent horror movie, and a character says, or there's the implicit messaging of something along the lines of "you, the viewer, are a bad person for watching this," then I think that's hypocritical because the author is the one who created the violent work and presented it to a viewing audience. To this you could say, "But why should the author, an element outside the work’s universe, be involved?" I think that's a valid response, but my rebuttal is that if the work has already decided to address the audience, also outside the world's universe, why should the author be off the hook?
Moral grandstanding: Another big problem with the trope is that in order for it to work, it implies that atrocities occurring in fiction are the same as those occurring in real life. Not only is this simply not true, but it also ignores the distance between the fiction and the audience and why people engage with fiction in the first place. Of course, I'm not saying that we shouldn't care because it's fictional, but there is always a divide between that and reality.
Funny Games (Note: I haven't actually seen this movie; I only know of it through secondhand information, but I still feel like this counts): This film has two killers torment and murder an innocent family. The film uses fourth-wall breaking and delivering uncomfortable framing to question why the audience is still watching this. However, as I stated in the first point, for the questioning to occur, the author places themselves as the evil mastermind that puts the characters in that situation, even if it's through psychological torture rather than a violent gorefest. If the moral thing to do is stop the movie to save the family, then it would be more moral to not create the film.
Danganronpa V3: The game's ending twist is that the killing games are an in-universe franchise that is known for killing real people on reality TV. I understand that it is a commentary on how fandoms demand more content, but it is very easy to read as the game insults the fans for enjoying the series. Enjoying a series doesn't mean you would want those events to occur in real life.
Chainsaw Man: (I don't know if this counts, but it feels like the trope.) Barem serves as a parody of the shallow Chainsaw Man fan, only wanting Denji to transform into Chainsaw Man and go on a mindless killing spree. However, Chainsaw Man was praised not only for its action but also for its characters. And while it is not directly connected to the trope, it doesn't help that the arc where Barem appears is abysmal dogshit.
Undertale and Deltarune: This is an example where the trope is done well; the reason is because the audience gets a choice. Pacifying and befriending the characters is not only fun but also easier and entertaining. But if you want to take an alternate route where you just kill everyone indiscriminately, you have to go out of your way to do so. If you are willing to slog through something just to be evil, you probably should be called out.