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More recently, he had cocooned himself in front of electronic game consoles in the basement of their home, playing warfare games.

The contents of the Lanza house are of intense interest because the lives of the family have been picked apart since the shootings, often yielding little insight. A clear understanding of Adam Lanza’s thinking and the texture of his relationship with his mother and others has yet to emerge. What pushed him to his brutality may never be discovered.
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Though Mr. Lanza’s life remains mostly opaque, interviews in recent weeks show that he was a socially fragile individual captivated by warfare video games and bent on military service....They said they believed that Mr. Lanza had spent most of his time in the basement of the home, primarily playing a warfare video game, “Call of Duty.” (NYT, 3/29/2013)

The New York Times has the answer. 

The New York Times writes the answer.

The New York Times refuses to acknowledge the answer.