What’s the threshold for something being ‘a thing’ as opposed to ‘it happens’?
Five ‘it happens’ = one ‘thing’?
Anecdotally, I can say that back when I visited my local public library on most days, it would be a rare day (certainly in winter) when there was not at least one person in the library who I would guess was homeless.
Either that or they were way ahead of the trend of wearing 5 coats on top of each other, not washing for several days and mumbling to yourself.
That may well have changed now that many libraries seem to have got rid of anywhere to sit (and indeed many of the books).
On the other hand many libraries are now designated as places for the homeless and unemployed to access government services so there may be rather fewer homeless people sleeping in the library and rather more trying to work their through the universal credit application system on one of the library computers.