Snowy Rainbow said:
Bro. Chill. I got your point, I just think you're wrong. I didn't mean to insult you or anything, though.
Now, I agree on the point that kids generally can't comprehend things as fully as adults can, but that doesn't mean that no seven-year-old can comprehend death. Even if the girl in your story didn't fully understand it, she's just one child and that is hardly a representative sample.
I knew what death was when I was that old because my grandmother's cat died. Even before that, I knew what pain was and I knew that it was wrong to hurt others because that was what my mother taught me. At the same time, though, she let me watch Jurassic Park enough times when I was five that it gave me nightmares. It didn't scar me for life. It didn't give me a thirst for violence. I just had a couple bad dreams about velociraptors.
Likewise, I would suggest that knowing what sex is at a young age would not ruin a kid. Now, if that kid was, say, molested, that's a completely different story. I mean, that would be downright traumatizing. But I seriously doubt that if a child under the age of 10 walked in his parents having sex, that it would ruin them forever.
All I'm saying is that I think that the effects of violent or sexual media on children fluxuates greatly depending on the kid, themselves, more than anything else.