The world is full of adults, people who can deal with violence in games and films. Some run amok or kill their classmates, siblings.
Fact is you lose the inhibition to kill, some more, some less, when playing such games.
I know it from my own experience. Only a few years ago I also played such games. I only had the rule that no blood splash, so no exaggerated violence. When I stopped completely, even to watch such films, I noticed that I now disgust when I look at a movie in which unfortunately blood flows. I even imagine some of the pain that people have and I feel even slightly bad. In the past, I did not care much for bloodier movies. I do not want to become so numb against violence again.
Monster or something, no problem. But thanks for the hint, now I know it’s not for me.