The issue is that education can be both an investment and a luxury. People spend lots of money learning to do all sorts of things as hobbies such as art, home brewing, photography, in which they have no desire to earn a living. This is fine. The problem involves debt. Debt can be a good financial strategy if you have calculated you will get a financial return. For instance getting a mortgage to buy a house could be a good investment if you compare it to renting but if rents are low and housing prices are high it might not be.
The same applies for going into debt for education. It may be a good thing if you calculate the alternatives. Spend 4 years working and building job skills vs spend 4 years not working and going into debt with the prospect of a higher income later, or some variant of the two. The worst choice is to go into debt while not learning anything that will help you get an income high enough to pay off the debt.
As for the argument that not everyone can be educated in those profitable fields I agree. It doesn't mean you can't learn what you like be it art, music, or philosophy. Those are fine and noble pursuits. But don't go into debt to do it. Get a regular job and instead of getting a degree just learn about it on your own or if you really want a degree take night classes or save up to pay for it.