It just results in very silly situations where the library buys the terrible copies and just happen to also have information on how the DRM works and which programs can bypass it and since libraries exist to provide information, if someone asks for it, of course you tell them. Same way as there tend to be copiers that are out of sight (and camera) range. At least a couple of libraries I worked for had information by the copiers on exactly how much of a book you could copy before it was considered copyright infringement, thus informing people that they could copy the books.
It's very kayfabe-esque.
You're right that it's a fundamental values mismatch. Personally, I'm an extremist who would crash every F500 company to prevent another Library of Alexandria. Knowledge > money.