My mom's big thing of interest was the holocaust; I watched a bunch of documentaries and listened to very sad tapes while elementary school age, as it's what she was watching/listening to at the time.
As an aside, there's a family video of me as a little girl playing with my Bingo Bear at my Gramma's house, and the conversation in the background (you catch snippets) is of my Gramma, an uncle and a couple of aunts discussing a then-current news story involving child rape. That Gramma was the first to tell me about certain types of torture too, she had a historical book with (thankfully not so graphic) pictures. Apparently, real life events were deemed acceptable entertainment/discussion around the kids, whereas fictional stories (examples, Terminator, Jurassic Park) were strictly forbidden. I didn't watch my first R rated movie until I was 16, but boy, I could give some detailed accounts of the Holocaust and some of my 17 century ancestors by the time I was nine, should anyone have asked.
I don't consider it SS to allow kids to watch or read certain types of movies or books, so long as the parent/guardian A--understands the subject matter, B--is willing to explain and talk to their kid about the subject, and C--doesn't try to blame or sue anyone else for their child being exposed to that subject matter.