I'm sure this concept has probably been ill used in the past, but if a class of people develops who totally depend on another class of people to exist can they be called parasites? If it is a parasitic relationship, are there benefits to the rest of the citizens in maintaining the relationship of support (symbiotic)?
Some symbiotic relationships are obligate, meaning that both parties cannot live on their own. Others are facultative, meaning that they can, but do not have to live with the other organism.
No, I'm not advocating any kind of wacko inhuman treatment.