From Elie Wiesel's article linked above:

"All we know is that Auschwitz did not descend ready-made from heaven. Human beings imagined it, built it, served it, used it against other human beings. When all is said and done, it represents a grave theological challenge to Christianity, an immoral abdication on the part of humankind."

I have always believed that it was not just the Nazis who were responsible for the holocaust but the entire world. All of humanity turned their backs and looked away. Many, many countries gave refuge to former Nazis and many, many countries denied immigration to surviving Jews.

Its easy to blame others and as long as we blame others, we don't have to look at our part in it. Just as we don't have to look at our part in what is happening in the Suddan.