It's the culture. We working stiffs aren't people. We're "human resources". Resources exist for but one purpose: to be exploited until they are exhausted. Once exhausted, they are abandoned in favor of fresh, untapped resources.
Not saying socialism is the answer, but is capitalism as currently implemented really that great a deal for people who work for a living?
"Nobody rose in Packingtown by doing good work. You could lay that down for a rule—if you met a man who was rising in Packingtown, you met a knave. That man who had been sent to Jurgis' father by the boss, he would rise; the man who told tales and spied upon his fellows would rise; but the man who minded his own business and did his work—why, they would "speed him up" till they had worn him out, and then they would throw him into the gutter."