Your academic training ends late in life. And therefore you have to charge higher and higher to make up for your investments. And of course, for the student loans too.
A Law degree from a 3rd rate school on the other hand is not so constrained and outside of 'top' schools which again are a limited supply tend to have minimal benefit.
I’d also support free college, but I’d expect all wages to fall accordingly. Or for the loan situation to repeat itself, this time to pay the income taxes on tuition waivers for grad school, as a masters or PhD becomes necessary to set yourself apart in the labor market.
[1] Jon Marcus, "Germany proves tuition-free college is not a silver bullet for America’s education woes" https://qz.com/812200/is-free-college-possible-germany-shows...