They haven't used libraries since childhood because they have this marvelous, easy-to-use instant-gratification database, the internet, which also tells them what to think about the informtion instead of requiring them to decide.
There wasn't any when I was a kid. (There was ARPANET, but that is clearly not the point.) We were taught to use the library in first grade. It took effort. The effort reaped rewards. The library was a privilege.
The library was not divided into Proper Thought Books and Improper Thought Books. The non-fiction was catalogued by subject, the fiction by author. That was it. The rest was up to us.