I know a few baristas in their 30s with six figure loans. Similar story for all of them. Barely 18, pressure to go to a good college, parents proud of their kid who encourage it more, who themselves are not the most financially savvy either. Throughout their college years, school administration makes it very easy to help them request another 10k or so at a time. Between parents, loan officers, and school administration, everyone is just whisking them through to sign and the money is theirs. Since it seems so normal and unquestioned, by people who are supposed to be providing guidance, many kids don't seriously consider the feasibility of the whole thing.
I'm a believer in personal responsibility, but I think when it becomes adversarial and systemically designed to provide all the rope necessary to hang themselves, it's hard to put the blame on some of the kids.