> They would have given me nightmares as a kid.

This is not always the easiest thing to guess. The things that gave me nightmares were people looking at me through mirrors (i.e., Snow White), animal brutality (which featured prominently in 90s family movies), and adoption (i.e. getting adopted into the "wrong", abusive family). Meanwhile I ingested astonishingly violent material and slept like a baby. I think it's hard to figure out what kids will identify as fantasy and what they'll see as a real, yet-unknown risk.