I know a couple people like this, and I know there are many out there in this situation with several kids to worry about. Maybe your aware of this and were referring to people with disposable income and savings, but those people don't really need to do something else because apparently things are working out for them better than the vast majority of people. I don't want to assume too much but this comes off sounding really badly.
Never-mind the fact that these low-paying jobs exist and someone will have to do them, therefore some percentage of the population will be in this situation, often despite working several jobs and dealing with a lot more than most of us have to on top of that. I don't see how anyone can have this view without also implicitly stating that some % of the population are necessarily just not good at doing things and deserve to live through that kind of struggle because of it.