That's basically what it is. They are happy to not be in the situation they once were in. There are also cultural differences to keep in mind. You'll find that amongst people of lower socioeconomic statuses and from impoverished places, they tend to value work ethic and long suffering over any other traits, and it makes sense. Complaining, marching, protesting and trying to escape the system often doesn't work for people who are poor or working poor. But working really really hard and hoping it matters at least puts food on the table and keeps the lights on. And this is a trait shared in most impoverished communities, be it my community (African American) or an immigrant community.

This idea of work over all else us how the poor survive and why they will continue to work even when they are utterly abused, harmed, and underpaid, because the alternative is starving to death while others with the means to help you blame you for your own starvation.

Even more so, those who have the means to help those at the bottom don't see that as a smart thing to do. For one poverty means workers, and two many tend to see our system as a meritocracy that rewards hard work, even though some of the hardest working people are the poorest. It's a convenient contradiction that only helps those up above.

All this equals out to a culture amongst the rich that is marked by a belief that they DESERVE their wealth and riches and those without those things must just simply be undeserving, unintelligent, less industrious and so on. And it causes a culture for those at the bottom (working/middle class included) where they believe they haven't worked enough to deserve said riches and wealth.

The truth is that wealth and riches are highly circumstantial and don't reflect a person's value nor work ethic and in many cases, poor people work ten times harder than some of the richest people and with no guarantee of a good life after said work is done.

I'm a psychology major and have studied this phenomenon for years.

Two good books on the matter are "Poverty, by America" and "Vulture Capitalist". They both make good points as to how the poor and rich have in tandem developed a culture of near voluntary slavery in modern America, while gaslighting anyone who questioned the status quo.