With a little ingenuity, a desire to succeed, and a solid work ethic, it's entirely possible to earn 6 figures with a high school
education.
It's entirely possible to work your behind off your whole life and still not end up making much at all, I've seen plenty who do.
And plenty of people, most people frankly,
don't have much ingenuity.
When you have an average, by definition you're going to have people who are above average, average, and below average.
The argument of Social Darwinists is basically the idea that those who are "below average" should starve, or die for lack of medical care, etc... or
that their children should (and the "let em eat cake" crowd will no doubt exclaim that they shouldn't have kids - but they do anyway.)
Work ethic is key. People work dead end jobs because they want to. Or rather, they don't want to put forth the additional effort required to
earn more than minimum wage.
People also sometimes have bad luck, and work dead end jobs because they can't find anything else
Whenever I run into this kind of attitude, I always wonder if the people making the argument have ever actually lived in the real world.