Those who can, do. Those who can't try to change the system to favor them.
My only problem with those engaging in such behavior comes from the subset of them who have much more privilege than vast majority of Americans - like say upper middle class and wealthy minorities. They often tilt the system even more in their favor over other poor, struggling Americans of whatever color or creed.
Many highly educated, wealthy female Brahmin Indian-Americans (2nd+ gen) are particularly adept at manipulating the system in this way to benefit them as "POCs" who grew up in exclusive neighborhoods with wealthy parents, and end up at Ivies. And yet constantly leverage their "oppression".
"Those who can do..." is similar. It's catchy, and because it's catchy people are more likely to believe it, particularly those who are fortunate enough to enjoy the survivorship bias of success. But like Cochran's slogan, it is not true.
But proof-by-aphorism is hard to counter with actual logic. I mean, look at the argument I am presenting right now. Don't you think it's starting to get a little tedious? Do you not find yourself tempted to tune out? Don't you think a lot of people probably already have?
The sad fact of the matter is that the most effective counter to proof-by-aphorism is often another aphorism. If the counter-aphorism is not entirely true, well, that is just part of the point. And the other sad fact of the matter is that many people achieve success not by "doing" but by gaming the system. Not all, but a lot. So I think it's very disingenuous of anyone to get up on a high horse about less successful people trying to similarly tilt the odds in their favor.