Read this.

Hannah Arendt, Eichmann in Jerusalem: On the Banality of Evil
[The following is in response to a story Arendt tells of Anton Schmidt, an SS officer who in the course of his travels through Poland helped Jewish partisans by supplying them with forged papers and military trucks for a period of five months before he was caught and executed.]

"The holes of oblivion do not exist. Nothing human is that perfect, and there are simply too many people in the world to make oblivion possible. One man will always be left alive to tell the story. Hence, nothing can ever be 'practically useless,' at least, not in the long run. It would be of great practical usefulness for Germany today, not merely for her prestige abroad but for her sadly confused inner condition, if there were more such stories to be told. For the lesson of such stories is simple and within everyone's grasp. Politically speaking, it is that under conditions of terror most people will comply but some people will not, just as the lesson of the countries to which the Final Solution was proposed is that 'it could happen' in most places but it did not happen everywhere. Humanly speaking, no more is required, and no more can reasonably be asked, for this planet to remain a place fit for human habitation."