Just don't say it's "free" - those who get the education pay back all they got via taxes (which in it's end effect are like paying down a student loan).
I had opportunities to move to the US and likely make 2x-3x what I make here and pay less taxes. I chose moving to Europe instead. It is the sort of society I prefer to live in.
And nobody thinks free education doesn't cost anything, just like people don't think the military doesn't cost anything. Somehow, though, there is endless trillions for "defense", and a little moth flies out of the wallet when it's for something that doesn't involve drones.
People with a degree: Get free education and free stipends, then get paid by the tax payers for the rest of their lives in their cushy government "jobs".
Affordable access to good education is a good outcome from the heavy taxation I pay.