Regardless of how we feel about the outcome of the George Zimmerman murder trial – “Not Guilty,” in case you missed it – I think most of us would agree the death of Trayvon Martin was a tragedy.However, the infinitely greater tragedy, it seems to me, is the high incidence of black men killing black men around our nation. This problem is especially acute in many of our urban ghettos. For example, Philadelphia, long known as “The City of Brotherly Love,” is now infamous for being a killing ground.