It's up to you to do your own assessment but I don't see any reason to be fearful.
These are regulars at that library who never caused enough disruption to be banned, and aren't dangerous enough to be in jail. They also have more to lose by getting banned than housed patrons.
There absolutely are people which are fine and there are one's that don't. No need to create these specific scenarios.
That's the whole point of that post.