If the Law of Unintended Consequences ever applied, it is in federal student financial assistance. Programs created with the noblest of intentions have failed to serve either their customers or the nation well. In the 1950s and 1960s, before these programs were large, American higher education enjoyed a Golden Age. Enrollments were rising, lower-income student access was growing, and American leadership in higher education was becoming well established. In other words, the system flourished without these programs. Subsequently, massive growth in federal spending and involvement in higher education has proved counterproductive.
His analysis, available here, shows how the program has failed by virtually every measure. In that regard, it is similar to most federal programs.