No mention of family structure in the analysis of the Columbine shootings -- remember this for next time

There's been some thoughtful reporting about the 10th anniversary of the Columbine shootings, like the NPR interview with Dave Cullen about his book, Columbine. The subject that fascinates the most -- still -- is what caused the two shooters to unleash their torrent of death and destruction. I'm as interested in this as the next person.But I've been struck while listening by a simple fact. No one