"Do no further damage." That is the essence of the Hippocratian oath. I want to know why someone who came to this country from an intolerable political climate came over here and was getting the best of all worlds--med school and an ivy league college education, when he decided to turn on the nation that accepted his family who came here for asylum politically, but decided instead to go and kill and maim people engaged in a health-promoting activity, the Boston Marathon.