My view on social media and parents giving smartphones to kids is the primary reason. When kids start overusing phones and digital world, everything seems binary, they can feel like they can control people in real-world as if thy do a 3d character in their latest game. And can get depressed when others don't behave as they intend to. A friend becomes a removable entity in a list or circle(google+) they can add or pluck out anytime, without considering the emotional factor others feel. I can talk on this topic whole day, i believe kids don'e need smartphones etc. and I will never bring my kids near them at-least till they reach their teen years.