The appalling silence of "Good Americans."

James Cone begins his essay in Soul Work; Anti Racist Theologies in Dialogue with two quotes. The first is by Dietrich Bonhoeffer who wrote:

Silence in the face of evil is itself evil: God will not hold us guiltless. Not to speak is to speak. Not to act is to act.

and the second quote is from Martin Luther King, Jr. who wrote:

We have to repent . . . not merely for the vitriolic words and actions of the bad people but for the appalling silence of the good people.

We are familiar with the pejorative "Good German" which refers to those remained silent in the face of the holocaust. What evils are we called to prophesy against? What does it mean to be a "Good American?"