> These books arn't consumed by people who are particularly aware of the cultural context of the ear in which they were written

Part of reading these books as a child or adolescent is being introduced to the cultural contexts of other times (and perhaps places). When a modern child reads a Victorian children's book, for example, they pick up pretty quickly that it's coming from a different cultural context. And this is a great way to learn about some of the more 'confronting' aspects of other cultural contexts in a pretty non-threatening way (they're just words on a page).