This type of thing never happened in my school days and you never heard of such until about twenty years ago as mrdux illustrated. I do believe that to some extent violent video games and social media help to fuel some of these festering situations... even such as the bullying mentioned earlier. These types of games and social anxiety serve well as combustion chambers, outlets and as training mechanisms for troubled young people until that one certain day when it all escalates to just these (all too frequent) hasty acts of stupidity that affect so many innocent lives. Prayers and condolences are with all who were and will be affected by such violent acts.