The sad truth is that looking poor in the US is culturally frowned upon, which often drives people to overextend their credit in order to fit in. People are quite often encouraged through advertising to improve their status through consumption in the short term at the expense of the long term. It's heinous, but that's America for you.
I really agree though, buy now pay later seems like a huge fiscal trap. Employment is at will and you have no guarantee about what tomorrow holds so it's good to try and live within your budget whenever possible... this doesn't really go for housing and the like though since those costs are so astronomical you're going to be gambling with debt no matter how long you save first.