Should librarians respect the privacy of child porn users?

This California librarian lost her job because she didn't; instead she reported to the police a patron who was using the library internet to look at child pornography. In this case, there was clear illegal action going on, and it doesn't sound like there was any policy requiring her to protect the patron's privacy. It seems she was fired because her supervisor had told her only to make a note on the patron's account and ask him to stop; calling the police was beyond her job description.

In one of my classes we recently had a discussion about a similar case where a woman was fired from her insurance company job after reporting an unusually high number of accident claims for a child to a child abuse hotline.

The insurance company case spurs some great discussion - because you have to balance the potential danger to a child with protecting private information. Insurance companies have access to a ton of information about you, and what if they were to allow their employees to ignore the security policies and start calling the police everytime they suspect something fishy? But how can you fault a woman who is just trying to protect a child? This is why entities that deal with people and information must have strict policies regarding treatment of private information.

But what about that librarian in CA... she wasn't the steward of any private information - she was just reporting what she saw in a public place. Should it matter that she worked there? Are there other factors that I am missing? Something just seems wrong.

UPDATE: Apperently I was missing something, like there is always more to the story!