Cheerful - re children's lit (by which I mean actual children, not "YA" or even teenagers)
"I agree that obviously a child's world has different concern's to an adult's - you don't get many children's books about mid-life-crises, the problems of retirement... But children don't live in a separate world to adults. They live in this world."
Actually, they do live in a different world than adults'. What they get from the events going on around them is very limited, because they have no knowledge of many necessary points of reference such as sexual desire.
Children's world is simple, with clear differences between right/wrong, good/bad etc. Children's books (not YA but books written for actual children) are written in the same manner. Protagonist is good, everyone loves her, she loves everyone, even if there is some problem, it is resolved and everyone goes home happy. Even in the atypical Grimm tales, children are good, wolf and witch are bad, etc.
"They (Children) suffer as much trauma, bereavement, loss and fear as adults do - ... abuse, complex moral battles in which the children are central, bastard fathers who don't want to see their kids any more and mothers posting things like 'I don't like my child'."
Nobody said children don't suffer. Of course, they do. Still, their world is simple and their understanding of what goes around them is very limited. Daddy hurt me, help mummy. I'm confused, why does mummy not help me, etc. Besides, children books are not written for the minority who are traumatised with abuse. They are written for the naive majority living simple lives where happiness is mummy's cuddles and chocolate.
I am not a child and don't want to spend time reading books written so that a little child will understand and enjoy them, whatever their themes and plots are. Other people's tastes may of course be different.