Why was the story watered down in Nobody Knows (2004, Japan)?

Why was the story watered down in Nobody Knows (2004, Japan)? - From above of fashion books and stylish ceramic vase placed on wooden table near window in cozy apartment

The movie Nobody Knows was based on an actual event, which apparently was considerably more horrific (Wikipedia) than the story depicted in the movie.

So why did the director-writer choose to water it down? I found this curious, since this is the exact opposite of the usual practice (at least Hollywood) where movies based on true events are usually exaggerated.






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Nobody Knows (2004) - A Movie Critique




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Claudia Schmalz, ready made, Dayvison de Oliveira Silva, invisiblepower