> ... then why aren't people on public assistance already doing all these things you imagine?
Because public assistance in the US sucks. It's designed to. It is political tool more than social policy. There's a word of difference between these two things:
1. We as a society value families and children, so stay home and take care of yours, and we'll make sure you have enough resources to meet your needs.
2. Better get a job soon, parasite, your benefits expire next month.
In which of those situations do you feel safe, or free to create? Or to nurture, itself the greatest act of creativity? Is it not enough labor for society to raise a family? Must every mother also constantly be generating profits for someone else?
This is not my direct experience -- I consider myself fortunate -- but I've seen plenty of it. Getting public assistance is humiliating, time-consuming, and uncertain.
Humiliating - asking for public assistance immediately labels you as a problem and a failure, even for many of those tasked with providing assistance.
There are limited resources (artificially limited, because of course we can always afford weapons programs and tax breaks for owners of capital and real estate). The public assistance system is non-trivially optimized to weed out people who don't need it, in order to conserve these resources, and this process can be fraught and combative. "Prove to me that you're a failure" is the message and the context.
Time-consuming - it takes forever. People on public assistance are often assumed to have no jobs. They have to go (usually slowly, on mass transit if they're lucky) from one government office to another, making and keeping appointments weeks or months ahead. They have to do this often while they live in car that provides shelter, but not transportation, since they can't afford gas.
Uncertain - a large portion of the US political apparatus has for decades spent vast energy and resources in reducing public assistance, and in demonizing those who use it ("welfare mothers"). As we speak the US administration is pushing through further reductions, designed (they say) to "push people from welfare to work."
No surprise that people in that context don't feel free or safe enough to create.