Some people actually like menial jobs. So in that way, "some people are content," although they do realize there's more... they just don't decide that it's necessarily personally better. Personally, I think it would suck to be a CEO. I don't want to be a slave to my job. I want to work 40 hours a week. Not 100. I want to work how I want, if I want, when I want. "Menial" jobs sometimes afford greater flexibility.
Some people are lazy. These people aren't motivated enough to go through the proper channels and avenues.
Other people recognize problems inherent in the system, and their personal values conflict with "jumping through the hoops." These can be either nonconforming extremists or just an arrogant subset of society that says, "if I can't do it my way, I won't do it at all."
It's not the American capitalist system. If you can't make it here, you can't make it anywhere.
The American system is doing nothing to promote the ignorance of the masses. There's enough of that going around as it is.
My parents came here with nothing and made something of themselves.
There's your answer. There's nothing wrong with being a cook at Denny's. Do you want more? Are you discontent? I believe you are, and I believe that's why you're taking steps to "improve" your condition. Other people find contentment in their jobs, or at least contentment enough in the "off-job" time that they're not worried about finding "that perfect job" which doesn't exist.
But some people were just called to be cooks at Denny's, that's all.