Well at least they weren't listening to Marilyn Manson, playing Doom, and watching horror movies, they may have killed the whole town and nobody would have heard about it until three weeks from now. There is no drug or video game on the planet that makes you kill people, that is a private decision and has nothing to do with it. The only thing video games do is make you aware of violence; the lynch-pin is whether the person knows the difference between (and I hate to use Right and Wrong, because cannibalism is a rite of passage in some cultures and it's considered a mortal sin in Catholicism as an example. What I can say, is that knowing that the law will punish you for certain actions and knowing that some actions are very undesirable to others is a very present force in our society and necessary to various extents) right and wrong, if they have no concept of this, violence and murder carry no consequence or meaning. If a person is mentally unable to recognize and abide those consequences and laws they deserve what they get; the real problem is that the meaning of violence was never made clear enough to these two apparently, it's either that or they're just common criminals who decide that it's easier to not follow the law and hope they don't get caught. My question is, where were their parents, if they just didn't have time to prevent this, they're equally responsible for not paying enough attention or keeping them supervised. If they couldn't afford daycare and they couldn't supervise their children they probably shouldn't have had children. I'm not saying un-supervised children will kill each other or themselves; I'm saying un-supervised children generally are more apt to accidentally hurt themselves or others because of their inexperience and lack of knowledge. Video games give people knowledge of how people and things can be hurt; it doesn't teach them when to hurt things or why to hurt things or even if it's necessary or not, that's up to everybody else, especially parents, to complete that knowledge.
TheNecroswanson
Personally, I think free will and destiny really don't make much sense anyway. Really, think about it, if you have free will and you think you have all the power in the world to decide your actions, then it could just as easily be said that your destined to think you have all the power to make your own decisions when you make them; but every decision you make no matter how free it may seem has already been predetermined by "Fate" or "Destiny". You're just changing the responsibility to something that can't be proven, the only way "Destiny" matters is if you had an opportunity to go back and make different decisions, proving you can change what has already been done, but you can't prove it either way, so it's simply little more than the glass is half empty or half full. Even if Fate decided you were going to chainsaw yourself 18 of your neighbors you were destined to get the chair. The jury are destined to think you are destined to kill more people anyway; or maybe you just went off the handle and the jury made the decision that your too dangerous to live because you're brutally violent and can't seem to tell the difference between what makes you somebody people will dislike and what makes you somebody they will dislike. The outcome is the same.