This is a good documentary on how students are being taken advantage of: http://www.pbs.org/wgbh/pages/frontline/collegeinc/%5B/quote%5D
I don’t follow your logic. If student loans are nationalized, how will that keep college cost down? The only way I can see of keeping colleges from raising the rates is to limit the amount of students that can apply. Nationalizing student loan = low interest rate & increase the pool of students = increasing tuition. Supply and demand at work.