When I was growing up in New York (worthy of note since they have far more resources for these things than small towns), the library I attended had partitioned areas for children and families separate from the rest of the library.
While this didn't mean adults couldn't go in these areas, it just wasn't set up in a way any adult would rather spend time in compared to other sections. This sort of a problem can certainly be solved.
Also I'd add on to the fact that the sorts of people who spend their day in a quiet place like a library, even if they are homeless, are almost certainly harmless. The strong economy has lead to an increase of rent seeking behaviors that have put working class people on the street.
While this didn't mean adults couldn't go in these areas, it just wasn't set up in a way any adult would rather spend time in compared to other sections. This sort of a problem can certainly be solved.
Also I'd add on to the fact that the sorts of people who spend their day in a quiet place like a library, even if they are homeless, are almost certainly harmless. The strong economy has lead to an increase of rent seeking behaviors that have put working class people on the street.