It's cut and dried that the FBI needed a warrant to perform a search without consent, and they went and got one. I think what is irritating to most people on this thread (me, anyway) is that the library did not consent to the search.
The Mayor and Librarian acted like an outraged homeowners instead of cooperative public officials.
Ah! Because a person chose to exercise their rights under the the Constitution it makes it bad.
Got it, but I'm not in agreement.
If it were me, I might have agreed to the search given the circumstances if it were explained reasonably, but since I wasn't, I'll go with door number 1.