They exist in capitalist limbo and serve as an example by which the system can keep everyone "above" fearful and hateful of them. Hate them for "leeching" but fear of becoming them. Disabled folk either can't work or can (kinda) but are forced to stay poor to receive assistance. There are two distinct social classes I have observed: the "subhuman" class (as in they are treated as less than human) that the System keeps unproductive and pays for lossing out on their labour, and workering class (producers). The poor, homeless, disabled, queer, black, prisoners, and felonies are some of the people who are forced to be unproductive to keep "more fortunate" workers from joining in revolt. It is a technique of rulers to keep the System stable.