I hate it when something like this happens and oh look, there is something to blame...its a band they wear masks too! They must be the reason why this boy is acting totally mental.
Its f*cking riddick! In situations like this its hard to say whether he had a troubled childhood, his parents ignoring behaviour that lead to the incident, or he is just plain messed up and can't seperate reality from phantasy/fiction.
Having said that though, I feel ever so sorry for the parents and family of the child that got killed, and what about the children that had to see it aswell? Thats going to stick in their mind for a very long time.