I have a pretty distressed and unpleasant reaction to child murder, and not really in a "Haunt Event" sorta way. Yea, technically Freddy is a child murderer, but I think the zeitgeist has him a lot closer to dreams, claws, or stuff like that before you ever get to that bit of lore from the first film.
Icons are marketing, first and foremost. Child Murder is not gonna be the marketing gimmick for a year haha. Even "Childhood Fears" feels like a bit of a stretch for a theme to me. Maybe at a smaller event it could work better.