mindset, oftentimes being soul destroying towards anyone in their circle who displays ambition to better their lives educationally and socioeconomically? What causes such people to be content with wanting nothing for themselves and for their families? Isn't this a form of mental illness?
No, mental illness would be much better defined as forever driving hard towards massive wealth that does not and cannot buy happiness. Giving up health, family and love for another dollar in the bank. Forever trying to "keep up with the Jones" (or pass them by!), forever climbing that all important social ladder to be "better", somehow, than the rest of the peons.
Not everyone is driven to feel superior to others because we have more money or wear more expensive clothes. To a great many people a comfortable but simple life is far better.