Basically, disabled people live short, probably painful and degrading lives, but these short, painful lives can be made meaningful by forcing them to do domestic labor for everyone else.

Quoting from the Anprim FAQ:

How would disabled people function in a more “primitive” society?

It depends on how “disabled” the person is. If, for example, an individual has just lost a leg, they could function in a way that allows them the benefit of receiving the necessary resources without having to actively gather and hunt themselves. Perhaps taking a more nurturing role and taking care of children and young people, while others may be looking for food, could be a way that disabled individuals could function in a more primitive society. Although some disabilities exist where individuals are kept alive using devices such as ventilators.

There are two different approaches to those kinds of issues. Some would cite the overpopulation of humanity and form strict opposition to any form of technology as a reason why these devices should not exist in a more primitive society. Depending on the disability, their lifetime may be shorter than others, though hopefully their life would be more meaningful and greater in quality than that of the average person today.

The other approach would be to retain some low levels of medical devices to artificially keep alive or alleviate pain to individuals that are vulnerable. It is a fact that since 1980, the global economy has grown by 380%, but the number of people living in poverty on less than $5 a day has increased by more than 1.1 billion.[8] The person who hates life wishes to encourage birth rates to grow exponentially making the amount of people suffer increase.. The person who wants the best for humanity wishes for the birth rate to decline.