I never said it's found only in those workers, my experience happens to be with workers who come from the more disadvantaged strata of society. You find many, wonderful people with a strong work ethic among them, but the rough living part is much more rough and visible - like doing heroin at work or pulling out a gun. This happens in all echelons of society, but it's just much less subtle in certain groups of people. On the upside, the people with good work ethic were promoted, got raises, and better benefits.