Uh. Ok. Well, I guess I can see your point.
There's a difference between learning ideas from books, and learning practices from books. I used to read a lot of Robin Cook novels but I never tried to remove my sister's appendix. I like the Spider-man movies but I don't try to shoot webs from my arms.
"There's a difference between learning ideas from books, and learning practices from books."
But the whole point here is learning ideas from books. Nobody has suggested that kids are going to imagine that they can manufacture cloaks of invisibility.