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This page is very frustrating to read. There is no way that it has enough information to make any informed conclusion. I feal like a real analysis needs to drill deeper into the data.

Why are students not repaying their loans?

After a student is "in default" on a loan (no payments for a year), do they ever pay it off? Being in default isn't like bankruptcy; the debt is still there and there may be reasons later to pay it off. I know at least some institutions that will not release transcripts while they are owed money; I don't know if there are any incentives to keep paying student loans.

The risks of default broken down by course of study is there, very roughly, but would more detail reveal the issues more clearly?

I'm sure that economists and think tanks have studied this problem. Maybe someone can post a link to some good article or survey on the topic.