it's a valid concern and I've heard reports about the dangers of car financing causing a crash - however the reality is that cars as relatively low cost products (as opposed to a house) are quite secure. If you finance a new car and then a year down the line you can no longer afford it, the worst case scenario is that you incur a small amount of debt for a couple years and the car company takes the car back and sells it on at a normal depreciated price like they would anything else.
Because car financing is generally only ~3 years worth of money, even on expensive cars it's not going to amount to more than £10K or so. which in the grand scheme of things is not a massive amount of money. Unlike the housing crisis where houses that are worth 100s of thousands went kaput.
so the financers are in a very secure position.
As for your pretentiousness about poor people driving nice cars - what is wrong if someone chooses to spend their hard-earned money on a luxury like a nice car? I earn the average salary in the UK and choose to spend a significant portion of my income on my car, because I like having a car that's fun to drive. I've recently taken out a lease on a new 17 plate car; I can afford it, it's a more affordable way of running a car than buying a used car, and I can hand it back in 3 years hassle free.
Car manufacturers make their money by selling new cars not old ones... they have to make the cars affordable otherwise they wouldn't sell any. So there are plenty of good deals out there on new cars.