I saw an interveiw with two of them right after she was missing. They were only there to make sure that there were no passport problems. That was it. They weren't babysitters. These kids were adults.
These kids were NOT adults. They were 18 at best. The parents of all of them were foolish to allow their children to run off to a foreign country with a couple of adults whose only responsibility was to check passports. I wonder if all the parents understood that?
Certainly when my daughters were traipsing around Europe without me in a summer school, they were with their grandmother, or they were with the parent of their roommate. And they were older — at least 21. And they were safe.