Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – Witnesses say a popular freshman, a member of the football team and the homecoming prince, took a gun to his school, and shot his friends and fellow students.
It's hard to understand, but not uncommon says Dave Cullen, author of "Columbine."
"It's all about the perspective of person. Objectively he may seem popular to us. But the person, especially a kid in high school, doesn't see it that way," Cullen said in an interview with "The Lead with Jake Tapper."
The gunman who opened fire Friday morning at Marysville-Pilchuck High School, just north of Seattle, shot five people, killing one, before turning the gun on himself, law enforcement officials told CNN.
While parents, students, and others are already searching for a motive, Cullen cautioned against that.
"The idea that we're going to get to some answer, in capital letters, which you can say in a sentence 'This is why he did it' is fairly unlikely," he said.
For more of our interview with author Dave Cullen, check out the video above.