God I'm so sick of this bullshit:
DHS spokesman Shawn Neudauer said the agent was simply providing "visibility/situational awareness," and did not have any direct contact with the Lebanon police or library. "The use of a Tor browser is not, in [or] of itself, illegal and there are legitimate purposes for its use,"
It's legal, and there are legitimate uses for it
The problem this library (and others) will run in to is the threat of lost funding if they continue the Tor project. Library budgets are already tight so the lost of ANY funding can be devastating. It's the only reason most libraries installed web filtering software.