Now for the discussion of brain damage. I'll begin with a closer analogy. Consider that there's a reason I and most other people call an adult having sex with a, say, twelve-year-old, to be abusive. Never mind if it's, technically speaking, consensual. It's still abuse. Why? Because the younger person's mind is currently developing - these experiences are going to be formative in ways that experiences ten years later will not be. I'm not sure if you are familiar with the characteristic behaviors of someone with this history, but I am very familiar with them - and they are not constructive or happiness-oriented behaviors at all. The person's mind has been damaged while it was forming, and it takes a hell of a lot of re-orientation even for functional repairs (which is not the same as undoing the damage).
If someone wants to take issue with my use of the term "brain" when I'm talking about the "mind," I just shrug. As I see it, the mind is the physiological outcome of a working brain. Mess around with the input as the brain/mind forms, and you short-circuit it, messing up steps which themselves would have been the foundation of further steps. You could be talking about an experience such as I mention above, or you could be talking about sticking a needle into someone's head and wiggling it around. Brain, mind, damage. I don't distinguish.
All that is the foundation for my point: that the routine human capacity for understanding, enjoying, and creating stories is damaged in this fashion by repeated "storytelling role-playing" as promulgated through many role-playing games of a specific type. This type is only one game in terms of procedures, but it's represented across several dozens of titles and about fifteen to twenty years, peaking about ten years ago. Think of it as a "way" to role-play rather than any single title.