Correlation != casuation. Degree in feminist basket weaving is not going to make you rich (unless you land a sinecure job in some Diversity Office, but these are severely limited in number) or even richer. It is almost guaranteed to make you significantly poorer unless you get some deal to get it for free. That's the part of the confusion - the fact that average college graduate now in his 40ies makes more than average non-graduate in his 40ies, does not mean getting into 100K debt would actually work out for you as a current college student.
It's like saying "stock market returns 8% annually long term, so I'll put all my life saving into Shady Gadgets Inc. that was touted to me by some guy I don't know on the phone". That's not how rational investment is made.
This. It's not at all clear people make more money as a result of college or if people who are generally more likely to make more money are also more likely to go to college. There are certainly some very famously high earning college dropouts.
It's like saying "stock market returns 8% annually long term, so I'll put all my life saving into Shady Gadgets Inc. that was touted to me by some guy I don't know on the phone". That's not how rational investment is made.