Oscar Pistorius

Human mystery still a factor in today's violence

How well do we know anybody? Not well, it seems. Each week brings another horrific headline and, with it, descriptions of those involved that often conflict with the facts.

Last Wednesday, Detroit was rocked by the news of a gruesome quadruple murder. Gregory Green, 49, of Dearborn Heights allegedly killed his two young children with poison and shot his two older stepchildren in front of their mother, Green's wife, whom he tortured and tied up in the basement.

As if that weren't shocking enough, after Green's arrest we learned he had murdered before -- his first wife, 25 years ago. She was pregnant at the time.

He stabbed her to death.

Despite that, people close to...