Not only Americans... just check your neighborhood... or in the mirror.
I was with you until "in the mirror". The fact is, most people in most places are not this corrupt. Most people are subject to a minority who happen to "run things".
As a matter of fact, this is part of the problem: the average person working a job and raising a family cannot comprehend the greed, the self-interested several-moves-ahead strategy that looks like things "just worked out that way", the corruption, the ruthlessness, and the dehumanization. If the average person fully understood these forces, then you would in fact have a situation where public awareness keeps these abuses in check.
Adolph Hitler himself described the phenomenon with surprising candor. He said: "The size of the lie is a definite factor in causing it to be believed, for the vast masses of the nation are in the depths of their hearts more easily deceived than they are consciously and intentionally bad. The primitive simplicity of their minds renders them a more easy prey to a big lie than a small one, for they themselves often tell little lies but would be ashamed to tell a big one."
Because they themselves do not use this level of deceit, it does not occur to them that others do. Therefore there is a certain innocence or naivete that prevents the average person from suspecting and guarding against such things.
A gaze into this mirror for most would reflect not such corruption, but a kind of innocence that ideally would know better. History is replete with examples, but of course that only happens elsewhere. It can't happen here. It certainly cannot happen in a manner that is subtle, not publicised, not obvious, not easily detectable. Or so the thinking goes.
The truth is, the corrupt are competing not with a vigilant and wise public, but against other sociopaths. Other sociopaths deal with this not by exposing all corruption, for that would harm themselves, but by carving out their own little niche that doesn't encroach upon the terriority of their competitors more than necessary. The average person has no clue how much they're being lied to on a daily basis by governments, corporations, and other institutions which enjoy an automatic credibility they have not earned.