I don't see how seven chaperones can reasonably hope to keep tabs on 124 teenagers. That is almost 1 to 20. I have not heard anything about how the trip was organized, what sort of guidelines, if any, were given to the children. Were there any behaviors that would result in being sent home? Was there even a system for sending a child home who violate any rules, if they existed. Had such a trip been done in the past? Had more reasonable alternatives, like Disney World or Panama City, Florida, been considered? Were they given any guidelines about hanging out at bars until the wee hours of the morning and picking up locals? What sort of activities were the other children in the group doing? Were there organized activities or were they all just on their own?
A lot of these "children" were 18, like Natalee.