We can no more control or predict when a shooting like the one that happened in Newtown, Conn., will happen than we can predict where lightning will strike.On Friday, 20 children and six adults at an elementary school were shot dead in cold blood before the shooter, an obscure 20-year-old who'd just murdered his mother, took his own life.We may never know what possessed Adam Lanza to do what he did. Looking back over a year that saw 13 different shootings that claimed the lives of roughly 75 innocents, motives are as varied as the shooters. In some instances, there …