I think of "destitute" as the keyword, at various layers of Maslow's hierarchy. The ones you talk about are destitute socially but probably have food and temporary sleeping provisions, seldom rising above the 3rd layer into esteem tho. I have a bit of my old network supporting me, and I sometimes think I'll get off the street.
I work as a waiter 30hr/wk in Mountain View at minimum wage, and don't make enough money yet to have housing prospects. Answering interview questions without needs being met sends overwhelmingly negative signals. I have all my professional stuff like books and computers in a storage unit, but rarely have a place to use it.
I don't apply for high paying jobs in my field because I know that I lack the basic necessities to make a good impression. I've tried and do entertain opportunities that fall on my lap, but I always make a blunder due to not having the resources I need and they fade away. It feels safter to not try, given domino effects of interviewing poorly (permanent record, data). "Learned helplessness" for sure. I was hired to my current job on the spot, thankfully, and almost didn't get it due to logistic issues that I'm intentionally vague about.
Personally I was not a supporter of Prop C and take no government assistance, instead fasting and meditating when I can't earn money and nobody in my network can help me out.
We'll get through this. I'm staying strong.