One would think that the explanation of such phenomena lie on a higher philosophical plain, I sure did myself, eventually the answers turned out no where else but the objective world itself ... you can take any of such teenagers as an example, trace their history, define their type, observe their behavior ... and you can have a next to a clear view of why are they following such behavior ...
And if the question is "Why is it happening to a lot of people?" ... well, we can just say that humanity has a pretty shitty collective

Hee! Hee! You are funny!

I can see that your world view is accompanied by a lot of philosophical endeavors

Yes! It warms the cackles (pun intended) of my frozen heart.

Yes, Richard is wonderful!