'Columbine' author Dave Cullen on how best to understand the Aurora shootings and the lessons that such catastrophes have taught us.
Thankfully, mass murders are rare in the United States. But the ripples of these horrors can extend for thousands of miles and dozens of years.
Consider how two journalists – both experts on killing sprees – found themselves connected to other mass tragedies by pure chance within just the past few years.
This week, I interviewed author Arnie Bernstein, who uncovered the hidden history of a Michigan town devastated by a 1927 school bombing. Four years ago, he told me, Bernstein found himself comforting a student who had just lost two friends to a gunman at Northern Illinois University.
And then there's Dave Cullen, a journalist who wrote 2009's "Columbine," the definitive book about the killings there. A few days ago, he discovered that a friend's brother was one of the people injured last week in Aurora, Colo. The brother, fortunately, is recovering well.
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