[randomdata]

The parent was responding to a quote about successful people, so there would be no reason to look at all college graduates. A significant number of them will not be successful (as measured by income).

As an aside, while trying to find income data by education that excludes outliers (sadly, I failed to find anything) as prompted by your comment, I noticed that college graduates with only a bachelors degree represent roughly 20% of every single income group, except for incomes below $30K, where they only represent ~10%.

I haven't had much time to digest the data, so I am quite possibly overlooking something obvious, but wouldn't you expect that number to rise with incomes if simply having a degree provides an income advantage?