This is sure to open old wounds. The Department of Justice announced today it won’t pursue civil rights charges in the 2012 killing of Trayvon Martin since the “high standard” for a federal hate crime can’t be met. Prosecutors said they would not have been able to prove beyond a reasonable doubt that Zimmerman intended to shoot the unarmed teenager in a hoodie because he was black. While not unexpected, the decision will add to the wrenching national debate over racial profiling, excessive force and gun rights. And activists will mourn another opportunity to bring the conversation into a court of law.