Teenagers have always "found" a culture different than their parents. If this generation chooses a bastardized and westernized version of Korean culture, well, it's nothing really new. Peer pressure and the desire to fit into a group is huge at that age.
I think it's not their fault.They are teenagers.They like something then they like it, no reason to argue with them if they are not hurting anyone.Time is changing and so is fashion and people's view on it.Kpop has become famous these days including their dramas and fashion. I think it's completely normal and okay for them to be attracted towards it. Anyways no one really wears their traditional clothes anymore.Besides, it's just for a certain time.Its fine for them to act as teenagers and do something they like for a while.