Mads Mikkelsen's character is so infuriatingly stupid. After being told the charges against him, he makes no attempt to understand the accusing party. He continues to act as if the accusations levied against him aren't honestly held by his accusers. Instead, he attributes malicious intent in the place of stupidity.
The entire film relies on a massive assumption followed by a huge oversight. Assumption being that "My child doesn't lie". They believe this to the greatest extent where they wouldn't…