My biggest issue with these tour groups how they travel in those huge groups with very little adult supervision. The family groups, sometimes annoying because they don't always follow the expected norms from our culture, are nearly always much better behaved than 500 - 1000 teenagers in a group. When we recently traveled with a group of 90 teenagers, we had high expectations for behavior. It was highly stressed over and over that if a behavior is unacceptable at school, then it's unacceptable on the trip. If they were to be caught misbehaving, then they would spend their trip basically shackled to a chaperone - if that didn't cure the bad behavior, they would be upgraded to being shackled to a teacher - and if that didn't work, they would be sent home at their parents' expense. Any damages caused would be paid by the parents (chaperones inspected each room upon check-in, each night, and at check-out) and if they did something illegal, their parents would be called to come deal with it again at the parents expense. We had the best behaved bunch of kids who still managed to have a great time. I think additional adult supervision and perhaps some similar threats to these tour groups might go along way. It's disappointing to hear that these liaisons are not helping with the situation at large.