You are expressing a very modern and ahistorical paradigm of what makes a human being valuable. Deep history shows us fossilized remains of people with injuries like broken femurs or no teeth that would have been absolutely fatal without continuous support. Disabled people are valuable simply because they are human every bit as much as able-bodied people are, and historically we have dedicated resources to caring for the disabled among us.
It is a very modern idea that labor is the only value a human being possesses, and that those who cannot care for themselves are worthless. What use is anything that we do, if we can’t even be bothered to care for people who cannot care for themselves? What kind of monsters does that pretend we are? And make no mistake, we all start and most of us will end our lives not being able to care for ourselves.
Personally, I view caring for the helpless as a fundamental function of humanity. And yes, we as a society fail at that function, primarily because we fail to recognize it in the first place.