Today is the 10th anniversary of the shootings at Columbine High School in Littleton, Colo. Along with thinking about the victims of the tragedy and their families, the occasion has me wondering about the parents of the young killers, and the guilt they must carry along with their sorrow.

Here's an article about how the parents of the killers, Eric Harris and Dylan Klebold, are doing now. And here's the 2004 interview that Tom and Susan Klebold gave to New York Times columnist David Brooks, which is worth rereading even if you saw it then. I keep coming back to this quote from Susan Klebold: ''Dylan did not do this because of the way he was raised. He did it in contradiction to the way he was raised.''

This post from the Huffington Post, reviewing a new book about the shootings, asks if any of us knows who our children really are.

(Photo of visitors to a Columbine memorial by Christ Schneider/Associated Press)