Games like GTA and Mortal Kombat have done edgy stuff, but they’re also really great games and technical achievements. Manhunt for example, was just boring and technically mediocre, which made it harder to defend and easier to hate. It’s the difference between a masterpiece of the horror genre or something like Nabokov’s Lolita, and a movie like Hostel or cp fanfics. How many developers and publishers will have great ideas that require shocking subjects, and then execute it so well that it’s defensible? Most publishers aren’t even taking risks with things aren’t divisive, they just want money and sequels and DLC. Serial killer or gore sims?... nah.
http://www.paulloeb.org/articles/InconvenientVideo.html
Serial killing is a drop in the ocean of blood you can spill by parallel killing in SimEarth, wiping out all life on Earth with meteors and floods!
There are a bunch of PEGI 18 games on consoles. Call of Duty World War II, Farcry 5, Fallout 4, GTA5, etc etc - all of these are PEGI 18 and licensed for consoles.