Bob Greene : The real reason mass murderers kill people is elusive . He asks whether outside influences play a role in inciting violence . Greene : These days , killers seeking lasting fame seem destined to fail . They are not motivated by the thrill of killing or even their own personal gain ; they don't have any other means of making money and
Bob Greene : The real reason mass murderers kill people is elusive . He asks whether outside influences play a role in inciting violence . Greene : These days , killers seeking lasting fame seem destined to fail . He says killers who commit suicide prevent us from knowing their motives .