That's true, but they make up a disproportionate number of the "visible homeless" that people encounter in camps, taking drugs on the street, etc. A lot of homeless people are at a low point in their lives, but use the systems offered to them and dig themselves back out. That's why they aren't CHRONICALLY homeless.

They don't represent the same kind of societal problem that poor students, broke divorcees, and people moving through rough patches do. They also don't represent a single population that needs help they aren't provided with already, unlike the chronically homeless.