This is a parenting book.
Yes, the details and particulars are about libraries serving homeless patrons, and for that it is great. I think all librarians and library employees should read it. Even if they have have no homeless patrons. Because the guidance in this book should be applied to all librarian-patron interactions.
And this book's guidance should be applied to all parent-child interactions. So it is a parenting book. And a teacher classroom-management book. It is a management and leadership book. It is a customer service book. I would daresay it is a policing book.