Chimney sweeps probably didn't think much of their jobs, either. Not sure of your point?
Seems to me that a poor person who works at Walmart rather than pillaging from the rich is actually complying with a system that offers them little. Surely this is more honorable than the likes of us who comply with a system that actually offers us a lot, no matter how dissatisfied some of us may feel. If we now start despising the honorable poor, we cannot complain if they start living up to our expectations of them.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1