Whatever you put aside is not going to be enough to prevent complete financial ruin if shit hits the fan. You might be able to cover smaller emergencies like an appliance breaking or your car needing repairs but literally just giving birth or being in an accident can bankrupt you in the US. I'm not at all surprised low to medium income Americans would just give up and accept their inevitable financial ruin instead of trying to be maximally frugal and socially ostracize yourself, forego most forms of entertainment/recreation and still not be able to get out of survival mode.

Desperation is a good motivator - but not for rational actions. It triggers our survival instincts: hoard what you can, feed on what you can get, grow fat, make rash decisions. This is what the modern economy is built on. FOMO, impulse shopping, conspicuous consumption, high calorie fast food, deals and discounts on overpriced goods, planned obsolescence, etc. We need consumers to be perpetually desperate and starving. Credit just means we can circumvent Henry Ford's problem of them not being able to afford to buy anything because they still can't afford it but are able to pay for it until their credit line runs out.