Yep, some plumbers are making way more...even than grads in "majors with a track record" (whatever that means).

The issue is that most jobs pay too little. College is not a reasonable way to achieve income equality. You can graduate as many people as you like, it doesn't create more jobs (this is how majors get a track record...by controlling the number of people who apply).

For the record, I know many cases of philosophy majors getting good jobs (as computer programmers). Apparently some employers find that people who take Logic classes can be taught to program, and then cost less (at least for a while). But your point stands, that most people have a reasonable idea of which majors give good employment prospects, and if they don't they can nowadays find out online what they are.

But, and here's the kicker, there are a lot of people who lump all college degrees together, either mentally or in their writing on the topic, and then justify going into debt to get a degree based on that. "Go to college" is not that easy to swap out with "go to college in one of the majors with a track record of leading to a good career", not least because there are numerous colleges (Fine Arts, some parts of Liberal Arts, etc.) where if that were the way people thought, that college would shrink to half its current size or less.

Which, maybe is what needs to happen, or maybe we need to find another way for society to fund people who study those topics (my preference), but either way it's not what's happening now, and those closest to the university system are generally the ones most hostile to the idea of looking plainly at the facts about the current situation.