There are some sick people out there (those mentally and those who are just mental) who can't tell the difference between movies/games - and there are those that didn't have the privilege of a good upbringing to gain a sense of stability and a good idea of what is right and wrong. Personally, I would put the blame on the parents if it were to go anywhere.
Does anyone find it suspicious that they escaped? I mean the state a child has to be in to commit something like this would have to be complete retardation or full blown stupidity. If the parents could not control their child, whether that would have been through medication of some sort or just some freaking discipline the tragedy could have been avoided. That's a problem with some parents today - lack of fucking discipline. Not to offend anyone, but I loathe ignorant children who have not been disciplined and do whatever the hell they want.
You guys know those shows where they have the whiny parents who "Can't cope" with their little shit of a kid, so they just give him/her what they want? Those parents should grow a friggin spine and punish their kids. That's where it starts and it just gets worse and worse.