Jocelyn makes a very good point.
But if Yarnspinner's library is being over run by people who are crazy or homeless, to the point that their behavior and/or smell is seriously disturbing other clients of the library - I can EASILY see the regular patrons of the library complaining about it, and avoiding it until something changes. I'd think it's a good way to get the library closed these days. And saying to call the police predicates a really well trained police force with enough staff to spare for libraries. Most of them make no bones about admitting they DON'T have the training to deal with people with mental issues, and they are generally are not willing to deal with merely stinky and misbehaving people when they barely have the staff to deal with active criminals. In addition, I've read an awful lot of news stories over the past 5-10 years where people off their meds and acting out get scared by the police, and are manhandled to the point that they ARE physically hurt, and then are thrown in a jail cell where they aren't helped at all, and some of them have died in those cells, or in the police car before they even get to the cell. Cops are NOT what ill people need - it's not fair to either set of people to sic the cops on the mentally ill, or physically ill, or merely smelly.
That said, if it were 'MY' library being over run by the homeless or near homeless, I'd be complaining loudly. I don't care when people sleep in my library (which they do) but I really don't want the crazies taking it over either, and making it an unpleasant place for the rest of us. I've been accosted by people who are off their meds, or never had them to begin with but they NEED them, and it's unpleasant at best, and frightening at worst.