Reminiscent of The Village of the Damned and Children of the Corn; Who Could Kill A Child is a Spanish horror film which was released in 1976 and directed by Narciso Ibáñez Serrador . It’s based on the novel El Juego de Los Ninos (The Children’s Game) written by Juan Jose Plans, and is about a couple who decides to vacation on an island off the Spanish coast. To their surprise, once they arrive to the island they find that no one is there. They search the town, the motels, and the business establishments but the place turns out to be a ghost town. Later on in the story the couple realizes that there are strange children inhabiting the island with no adult supervision. At first the children seem innocent enough but later on the couple unfortunately finds out what happened to all the adults.
I would suggest you check this out if you haven’t seen it. I think the performances of the children was very convincing, and for the time that this film came out I undoubtedly believe it to have been controversial.