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Boy child spent a lot of time playing a wide range of video games growing up. He's 22 now and still does. Until he was in his mid to upper teens they were always played in a family area in our home. He eventually got his own computer and played them in his room. While we did not constantly monitor his gaming activity, he was not isolated from the rest of the family.
Without others to provide, well, most of the supportive things a family should be providing, there is an opportunity for people to isolate themselves within a world of video games. Some people are susceptible to being brainwashed, others are not. Modern, violent video games make it possible for people to brainwash themselves instead of requiring other humans to provide the constant, persuasive stimuli. An over-simplification, perhaps, but I believe there is something to it.
BTW; I am not in favor of banning any categories of video games, and I don't believe that we can force people who have children to be good parents. I do believe that public schools have a responsibility to protect the people within them, and that as long as school administrators are allowed to shrug off that responsibility these horrible events will continue to happen.

Jeff