What you're missing here is that poor people KNOW that they are poor and right on the edge. They are already making a lot of adjustments that you probably can't even conceive of. They have a daily, hourly even, intellectual load from financial panic that more privileged people cannot even imagine.
The banks are the guilty party, here. They know that some of their customers are near the edge and in trouble, and they are strategically choosing to exploit them. Period, paragraph.