IMO children are not being raised to have coping skills.
Not that I'm a perfect parent nor claiming I'm doing things correct, but I don't coddle my children and when there is an incident at school I don't make a huge fuss and run to the principle and demand my child be treated a certain way. I basically tell my kids some kids just suck and to ignore them and to not react back at them. Both my older children 13 and 14 have dealt with bully's and it's not that I don't take it serious but I want my kids to be strong enough to deal with it and not let it devastate them. We have dealt with death, molestation, abuse from their bio dad and many other life challenges. But we deal with them. I don't know this kids story or why he did this but it seems it all stems from how they are raised. Not blaming parents either it's society as a whole IMO.