People making low wages work hard (harder than the majority of folks on this site; e.g., there wasn't a single janitor at my last office that didn't have multiple jobs to make ends meet), but it is unlikely they will have excess funds to pay for an advanced degree without taking on substantial debt.

Funding education via individual ability to pay vs. taxation perpetuates class divisions from birth-- a defacto caste system. It sounds like you and your children chose your parents sufficiently well that this is not a concern for you. Lucky you.

I predict that the "Fuck you, I've got mine," attitude is, in large part, going to be what brings western society crashing down. And, I would argue that this attitude, and the policies that naturally flow from it, absolutely had a part in creating our fucked up system-- where people who did not choose their parents as well as you have to take on debt to get an education, in the first place.