The House in the Cerulean Sea

I enjoyed this book very much, becoming one of my favorite books of this year, I had the opportunity to listen to it as an audio book and I just couldn't stop listening to it. It made my heart joyful and happy. And Ι am just waiting to get my hands on the 2nd volume of it! The different characters, the storylines, their attributes, their humour and everything this book had to offer!

Is every book problematic? Do we analyze things too much?
Growing up I ve read books and books with hidden meaning, having wars, killings, history as source. If we are cancelling everything, then in a few years, nothing could be a reference. And yes, before I am judged as not understanding, my country had war, refugees, army camps, missing people that have never been recovered and the story was the reference of many books, as long as the book doesn't make fun of the history, the source, the humans, why should I be bothered?
Masterpieces like Narnia, Lord of the Rings and many more, wouldn't have been possible today. Would they?