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Truthfully, and officially, no one knows. Anything else would be purely supposition. As Lanza ended his own life and left no note, or much in the way of clues, we can never know with even the remotest form of certainty.

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10y ago
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11y ago

No one can ever know with any degree of certainty.

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Wiki User

11y ago

From violent Video Games and going to shooting ranges with his mom.

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Q: What caused Adam Lanza to kill?
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