According to many theories, this seemingly innocent and beautiful song has a very dark theme surrounding it — a theme of death — lots and lots of death.
In 1940, shortly before they emigrated to the United States, he arranged seven of the pieces for two pianos, to provide additional repertoire for himself and his wife Ditta Pásztory-Bartók to play.
It just sounds to me like there are a lot of people with too much time on their hands trying to turn something perfectly innocent into something sinister.