I call BS.
"As people came in, he would approach them," Muller said. "He prevented people from simply using the library."
How could he prevent people who had gone inside the library from using the library as he remained outside the library? Again, I call BS.
I too would be annoyed by being forced to engage in a conversation where the young Mr. Hanson asked about my religion and offered biblical advice; just as I would be annoyed by young green believers asking about my carbon footprint and offering advice about serving Gaia.
And the hassle of dealing with Hanson's evangelizing could certainly put-off people from using the library.
The library gave Hanson fair notice, it is perfectly appropriate to give a trespass notice to him, so the people who want to use the library can do so without be hassled.