They are basically lacking the experience and have limited knowledge of the world around them. And us adults often fail to understand their mental model, since

They are basically lacking the experience and have limited knowledge of the world around them. And us adults often fail to understand their mental model, since we usually won't connect the same dots, but there is definitely logic to their reasoning. It's best to try and ask more questions to know how they've come to some ridiculous idea, and they usually reveal one or two steps that I wouldn't think about.