Columbine/Teaching Non-Violence

April 20, 2009, was the tenth anniversary of the massacre at Columbine High School, just a few miles from my Denver home. My wife, Joyce, and I visited the school a few days after the shootings and my lasting image of the event was seeing the adults kneel down in the springtime mud and sob, mystified over why our children were killing one another. In recent weeks leading up to this ten-year milestone, America has seen an outburst of mass killings -- in Pittsburgh, Oakland, Seattle...