When the Librarian becomes "the bad guy" (or girl)

In our studies of copyright law and the role of the librarian, I've been thinking about some issues we've encountered in the high school in which I teach.

Three years ago, our old (and I mean that in both contexts: former and OLD!) librarian, who was stuffy and formal and not very welcoming, retired, and a new, young librarian took over. She had been working as a librarian for several years in another building in the district and assumed the high school position.
As per her training (from Pitt, by the way), our cheerful new librarian set about making changes. She greatly expanded the library webpage, adding sections for links for each course and teacher, and posting helpful links for documentation of resources, book suggestions and "fun stuff". She established several book clubs for different groups of students. She re-decorated the library with catchy reading posters and enjoyable images. She set up a smartboard for demonstrations with students and teachers. She worked with teachers to create lessons that developed critical thinking skills and the understanding of the research process.
And, she began to "weed out" the stacks. She never announced that this was happening, but went about the process because she had been trained to do so. She saw it as her professional responsibility to eliminate books that were not being used or that were so outdated as to no longer be appropriate sources for research. The books were donated unless they were in such bad shape that they belonged in the trash pile.
But the high school faculty, especially my colleagues in the English department, did not take kindly to this "weeding". Like Nicholas Baker, who decried the loss of archival texts in Double Fold, my colleagues unleashed a torrent of rage upon our new librarian. They demanded to be consulted about any future discards. She agreed, sending messages inviting staff to look at the latest selections and to take book for use in a classroom collection.
Our new librarian had always intended to ask the staff to suggest titles of new books to add to the collection, titles that would complement the curriculum and that would provide excellent options for free reading. And the staff responded with many requests, which the new librarian dutifully ordered.
I thought that it was really unfortunate that this new professional was labelled as "bad" because she was trying to do her job. Some teachers remained bitter about the "weeding incident" for a long time.
I think this situation reveals a problem: the teachers in the building saw the library's holdings as their own, and the librarian saw the stacks as her domain, shelves crowded with outdated books. After the incident (and with intervention from administrators)communication was established between stakeholders.
In addition to the myriad copyright problems we've discussed, what are some other circumstances that might prompt library patrons to label the librarian as "the bad guy"?