I 100% believe that video games can act as a cataylyst for things, but at the same time, if it wasn't video games that were the "trigger" it would have been something else. Like I mentioned about the pastors son. If it wasn't Halo 3 that triggered this event, it would have been something else.
I never delved into it too much but the son planned it out. He took the gun from his fathers safe, walked downstairs when his parents were watching tv and told them to close their eyes that he had a surprise for them. He shot them both in the head, the mother died while the father sat on the couch for hours still alive. IIRC (I maybe wrong) but I believe it was his other brother(maybve sister) who found their parents and called the cops. They thought the father was going to die, but he pulled through. And what's amazing is that he actually forgave his son for doing it.
Well, with so many problems and abuses that people go through, it is normal to hear things like this.