In the wake of the Nashville school shooting, we are understandably brought once again to the seemingly unanswerable question: what in the world drives people to do this? The common answer from armchair therapists everywhere is: "childhood trauma." No. That's not it. Many of us were traumatized, and we didn't become violent. So what is it? This week, we look at the real reason people turn to violence. Here's the bad news: our society is on a slow march to more and more violent crime if we don't stop this in its tracks. Here's the good news: we can stop this in its tracks. The choice is yours.