If he had been truly courageous, he would have taken Hitler down personally, instead of leaving that bomb and walking out.
I hate to admit this, but the bravest resisters/dissenters during The Second World War-aside from the courageous Roman Catholics and Protestants who spoke out against and vehemently opposed the Holocaust-were the partisans.
The internal opposition in most of Nazi-occupied Europe, consisted almost entirely-with the exception, as I've already mentioned, of the devout-of communists.
That being said, it was the extreme fecklessness of the German Communist Party that led to Hitler's acquisition of power in the first place.