Why is it essential to all librarian's to acquire classroom management technique apart from overseeing the overall operations of the library?

Librarians usually have three key roles: literacy advocate, resource manager, and research specialist. The ability to communicate well with library staff as well as with all patrons and guests and deep knowledge of books is all they need. But some of them could say that the library is your classroom and you are responsible for it no matter what’s happening there. The book "Classroom Management for School Librarians" by Hilda K. Weisburg could help in answering your question.