I particular love old style mysteries like Agatha Christie and Dorothy Sayers where detecting was fun, but now reality is so much to the fore. To me, Alistair Maclean, my forever favourite adventure thriller writer, is another example of weaving fact with fiction and at the same time giving you fast-paced escapism. Heroism was at its best, now they are seriously flawed, and highly cynical.
That's why I thrive to make my adventure thrillers fun - sure, there might have serious moments but the whole point is too entertain and escape. I believe a lot of people want this, rather than just read ultra serious books merely mimicking the headlines. Books can be topical, but fun too.
I believe that YA typifies that fun and escapist element, and has less cynicism. Sure, its market is different, but these books are pure escapism, and that's why some adults read YA. In the library I work at, I have seen plenty of adults borrow them, and I'm not too surprised when I learn that it's for them and not for their children. One example sticks out in my mind is when a lady came in and borrowed a handful of YA books. She told me that she prefers YA books for the very reason that they are fantastical, light, escapist and she found AF was too dark and gritty.
There's room for all types of books but I would love to see more fun and entertainment in books.