Maybe these young people will one day learn that death is common to all, and that there is an eternal soul.
I believe that humans like most territorial creatures are wired for immediate feedback and through learned behavior expected feedback.
Children learn (are socialized) through interactions with adults what is acceptable behavior. Polite behavior is not hereditary.
Facebook and the internet in general removes that immediate feedback or at least we have not learned to expect feedback
Computers and the internet has isolated and impersonalized our interactions. It has created internet bravado. You cant touch me; you dont even know who I am, so I can say whatever I want
The internet is a totally alien environment for humans and it may take generations to work out how we properly interact in that environment (if we ever do).
Although not entirely on-point, I offer this observation (which I think is original):
Americans are a people increasingly separated by our connectivity.