Shooters of color are called ‘terrorists’ and ‘thugs.’ Why are white shooters called ‘mentally ill’?

 The Washington Post: "Police are investigating the shooting of nine African Americans at Emanuel AME Church in Charleston as a hate crime committed by a white man. Unfortunately, it’s not a unique event in American history. Black churches have long been a target of white supremacists who burned and bombed them in an effort to terrorize the black communities that those churches anchored. "