I think mentally ill or ‘druggies’ fit the majority of homeless folks (probably 80-percent). The rest have zero skills to make any income in high cost urban areas (Seattle, Portland, SF, LA, NY).
You could predict this lack of skills problem twenty years ago was going to occur.
Meanwhile, AI and mechanization, and offshoring labor reduce any job opportunities for the blue collar/entry level white collar occupations and more and more people will find themselves unable to find any employment other than, maybe, flipping burgers - which will be automated too, soon enough.
We need somebody in the presidency who will understand this problem and address it - let's say, Donald Trump - if we don't work on this, our children and their children will living under those overpasses.
Better not to engage crazy people when they’re doing crazy people stuff.