Margaret Soltan of University Diaries notes that on occasion, perpetrators of school massacres have (divorced or separated) gun-collecting moms.  A commenter points readers to "Mental Illness, Mass Shootings, and the Politics of American Firearms" in American Journal of Public Health.  The authors consider a number of the pat (and sometimes not-so-pat) explanations and find them wanting.  Yes, it's an academic article, and yes, the authors pay due homage to the obligatory post-Enlightenment hobby-horses.  But pay close attention to the closing sentence. "Ultimately, the ways our society frames these connections reveal as much about our particular cultural politics, biases, and blind spots as it does about the acts of lone, and obviously troubled, individuals."  Nothing can bring you peace but the triumph of principles.  Understand what behaviors confer evolutionary advantage, and what institutions work against evolutionary advantage.

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