If 35% percent of population do something, then it is better to look for structural reasons other then "population is stupid" simplification.
Note how I don't use the phrase "population is stupid", or that the reason is "stupidity". It could be a whole host/variety of reasons for people choosing to ignore possible life events. Everything from a misguided belief in a non-existent "safety-net", conscious decision to accept the risk, or plain not even remotely foreseeable life-altering event. Somehow, I doubt 35% falls under "unforeseeable".
Could also blame the paperwork and complications we like to create for ourselves so some middleman, middle-company, or politician get their piece.
I guess you could call that some kind of inflation too, but it's pretty self-inflicted.
With a car you have to take into account whether it can be assumed to improve your likely hood of getting a better job/getting any job/keeping your current job or otherwise make you money.
A cell phone may very well be necessary to get a job. It likely doesn't have to be an iphone, but it may be the cheapest option if you can get one subsidized, especially since it allows you not to have to pay too much money right now.
In general debt can be a very good thing iff you can reasonably expect to make more money than you did before.
Obviously people are complicit in this.
I guess it is blamed if you buy a car (luxury) and blamed if you do not buy a car (car being a symbol) case.