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Not sure why one would lump together the disabled, mentally ill and the lazy. The first two are incapable through no fault of their own. Why should they suffer the same fate as one who chooses not to contribute?

Just because it's so difficult to categorize each person as one of the three. Many disabled or mentally ill people do work. But many disabled people could work but are too lazy. Besides, there will be some small fraction of "the minimums" that are using it to live as they create art, music, poetry, and any number of other things we should value but that have no ready market. You have to play a musical instrument for 10 years to reach the maximum skill that your innate talent allows. Lot's of human endeavors have that same apprentice period. You could also support college students in that same way.