Then look at a wealthy kid born to a wealty family who works his ass off every day.
Even if they make the same on all of their standardized tests, make the same grades, and go to the same college, and get the same degree.....
Who's going to be more successful with the same amount of hard work?
And sure there's outliers but it's hard to argue that one's situation matters much more than the individual and this bizarre American sense of individual exceptional-ism is really naive.
I think stems from early Puritanical settlers who believed in pre-determinism and God rewarding people Materialistically the better person you are.
I'm pretty successful but I credit my family, being born in a 1st world country. My hard work was the tiniest of all parts of it. Had I been born in Romania or Zimbabwe I would not be where I am no matter how hard I worked. Conversely, I probably could have been way more successful if I had been born in a truly wealthy family.