In 1954, William March published a book about a child who kills not because she's an invading alien, like the kids in The Midwich Cuckoos, or because she's the antichrist, like the kid in The Omen, but because she's entitled, covetous, and completely immoral, like Donald Trump. Because of its all-too-human monster, The Bad Seed was a genuinely scary novel, and with its tight storytelling and clearly defined characters, it was ripe for adaptation into an equally chilling movie.
The problem was it was a little too ripe. Producer/director Mervyn LeRoy should have sat on The Bad Seed until Hollywood was ready to make a picture about children killing children without pulling punches. Instead, Warner Bros. rushed it into theaters in 1956, forcing LeRoy to defang March's tale with camp eight years before Susan Sontag even got a chance to define the term.