Room & board constitutes 1/2 - 2/3 of the cost of undergraduate school. Even in European countries with free tuition (and that's not as common as you think) students still often must take out loans for living costs. With financial aid the typical American student ends up financially similarly situated to their European counterparts.

The problem of college affordability is arguably another dimension of the housing crisis. You can look at the numbers yourself. Yet oddly I've never seen this pointed out or discussed, not in the media or anywhere else.

In principle an easy way to lower the cost of college would be for public universities to invest in building more subsidized or free dormitories. The problem is that most of the popular coastal universities are in areas where development is absurdly expensive and contentious, even for government.