But surely stories affect people, sometimes deeply? Watching a violent movie might not make people more violent (especially in a quantifiable way), but watching scenes of violence might make you want to stop watching that movie. You may even be ok with violence in some movies and deeply disturbed by it in others, and when you are disturbed, it might not even be that you don't want to watch those movies, but you need to be mentally prepared. The social aspect of TTRPGS exacerbates this dynamic, because the experience is a conversation, sometimes with people you don't know, and if the dm introduces an element they think is fine but you do not, it can be a very negative experience.