Reaction to Friday’s school shooting in Newtown, Conn., has been loud and swift. New York City Mayor Michael Bloomberg called on President Barack Obama to make gun control his No. 1 agenda. The dean of Washington’s National Cathedral said, “enough is enough ... the massacre of these 28 people in Connecticut is ... the last straw." A sense of helplessness and frustration is palpable across the nation. While many are calling for more controls on guns and ammunition, others say we must focus on creating a more accessible mental health system. They worry we aren’t doing enough to de-stigmatize treatment. Diane and her guests discuss the effects of mass shootings on the American psyche.