A failing public education system and increasingly consumerist culture that encourages bad spending habits using psychological advertising tricks, to start. Go look at how little savings Americans have currently as well, which has been covered ad nauseam by most news outlets in the past few years.
> Without the painful transparency, it becomes too easy for the government to nearly invisibly turn up the tax rate on individuals to pay for whatever boondoggle or foreign war they see fit.
Given that it directly affects take-home pay, any significant change is pretty noticeable. Heck, even Trump's very small changes for the middle class were noticed on paychecks slightly, though there was also an unequal decrease in witholding that made people's refunds smaller.