I'd say the majority of people do not understand the financial effects of compound interest. They are focused on whether they can make the monthly payment. They do not understand how all of this affects them financially over a period of even 4-5 years.
IMO, this is a failure of the education system. Financial decision making has a lot to do with a person's lifetime well being, and yet students are not being provided with an understanding of basic finance skills. This isn't helped by textbooks that focus on mathematic calculations instead of teaching concepts and practical application which could be due to people in academics being lacking in real world experience, ie, specifically the kind of things being posted here that really go on in real life.
Around the 2008 time frame, people who were accustomed to making good money sometimes found themselves having to file bankruptcy, particularly those who got caught up in making money flipping real estate and suddenly the bottom dropped out on them.
Then's there's another group who get thrown a curve like illness, high medical bills, unexpected loss of job.
Then there are a few elderly who just don't have enough retirement income or assets to make it.
But there is also a group of repeat filers who know how to use chapter 13 to get themselves a lower car loan. They predictably file a new case about each time they get another car.