Episodes of gun violence at America's schools are both heartbreaking and disturbingly frequent, but the circumstances that inspire them remain elusive. A new Northwestern University study comes up with at least a partial answer.
It finds such incidents are more common during periods of high unemployment. During an economic downturn, the assumption that a diploma leads to a good job is revealed as false (at least for the moment), leading to frustration, disillusionment, and, sometimes, violence.
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