Sarah Newman has studied school violence , says stabbing attack has many of them . She says they tend to happen in ` ` safe '' rural towns and suspects first appear as loners . She says attackers often are ` ` failed joiners '' who find comfort in actions . Newman : It 's small comfort for Pennsylvania ##ns that attacker used knives instead of guns .
Katherine Newman has studied school rampages , says stabbing attack has echoes of them . She says they tend to happen in `` safe '' rural towns and suspects first mislabeled as loners . She says attackers often are `` failed joiners '' who seek acceptance in actions . Newman : It 's small comfort for Pennsylvania town that attacker used knives instead of guns .