I can not possibly disagree with you more (except perhaps the last sentence--although it is inconsistent with your point about holding teenagers accountable). There is no way that I would let my 17 year old daughter travel for "massages." If I couldn't have reasoned with my child, I would have been on the phone with the police, lawyers, the airlines, whoever would have listened!
Parents have a responsibility to protect their children, even if it makes the child angry. It's our job.
The father of the girl in this case sounds like a completely scumbag. I have seen nothing that indicates that he expressed any alarm when his 17-year old daughter went overseas with an older man, and yet now he's expressing shock that there was sex involved? (gosh, who could have known?)
And, no, I am not saying the girl deserved to be raped or trafficked. I am saying that her father is a scumbag who should be prosecuted for failure to protect his child.