This field draws on a lot of the same people who are drawn to social work. They know they're not going to make big money doing it, but they're going to get into

This field draws on a lot of the same people who are drawn to social work. They know they're not going to make big money doing it, but they're going to get into it anyway because taking on the profession is a virtuous thing to do. There's a degree of willing self sacrifice, especially since (like other similar fields, such as museum curation) it practically takes someone dying for a position to open up. Given all of this, these librarians aren't being tricked by anyone. It's just one more moral, virtuous thing to do for the community, despite not having the training or support to handle anything but the easy cases.