Sick of Bonhoeffer? Why the USA Can Celebrate a German Martyr, But Not John Brown

Dietrich Bonhoeffer was born in 1906, and was a German Lutheran pastor, a figure noted in the theological world for his neo-orthodox views, and his most popular book, The Cost of Discipleship.  Bonhoeffer is more widely remembered as an anti-Nazi dissident who was a key founding member of the Confessing Church which opposed the Nazis.  In the 1940s, Bonhoeffer joined the German underground, but was arrested and incarcerated at Tegel Prison, where he remained for over a year. However, In 1945, documents were discovered that named Bonhoeffer among the dissidents and orders for his execution were made directly by Hitler himself.  Bonhoeffer received no fair trial and had no lawyer to defend him. To humiliate him, Bonhoeffer was marched in the nude to his gallows with a few other victims, although the time for execution may have been drawn out and all the more traumatic. According to one source, Nazis were known to interrupt a hanging, revive the victim, and then continue the process repeatedly before final execution. 

Today Dietrich Bonhoeffer is considered a hero. The question posed in this brief episode is, why is Bonhoeffer a hero for so many, but John Brown is not?