This is of course a reality for some–sadly, we cannot create a bridge to our sin/unrighteousness using this argument. In the US people go missing, that’s a fact of life. But ostentatious behavior (unrighteousness) out of one’s own choice cannot be measured in the same level as anyone who is coerced into such situations.
I’ll give an example: one day, while flagging a cab, I met a dancer; she was beautiful and just my type; she was very forward as she asked me to take the cab to the place where she was dancing; I felt the attraction and all through the drive I attempted to persuade her to give up the “art.” As beautiful as she was she could well be a runway model, our a stunning receptionist on a high end business or the best paid saleswoman in any field (yeah, she was that stunning); everything was met with a ‘nah.’ She explained that she made more in a few hours (she promised me that all she did was dance) than in a month in any of those other careers.
She took to me, and asked me to stay with her (dance)… finally, she asked that I pick her up.
Knowing me, I could not share her with anyone–even if I were to stay by her side during her dance; knowing God I could not be part of that lifestyle. Her choice was clear–she preferred that life to anything else.
So there are choices that we make/must make. Some times that power is taken from us (Christians and others persecuted and killed); but even that does not diminish our response to God’s Call.
Those girls that you’ve cited could well have prayed to God and offered themselves to Jesus–the ones that do not believe in God, have you not considered that the Holy Spirit can Touch even the hearts and minds of non-Believers?