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 . In the instances we studied , all that effort starts to pay off the day they start talking about killing people . 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 .
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 .