I can't be the only one to think that one of the better solutions to these problems would be to reissue such classic books with lots of footnotes, rather than keep them out of libraries. I loved books with footnotes as a kid, I made sure to read every one so I could be sure I understood every nuance of the text.

Not to mention that if I'd had to wait until my class covered problematic texts I would have been bored out of my skull with little left to read. I was the kid reading several years above my level and spending most lunches and afternoons in the library because I wanted to read every book while I still had access to them.