All of these films were critically acclaimed and several won prestigious awards. There are more, but my memory has run dry. Well, if you think about it, the Holocaust occurred in another part of the world. It's probably an easier money maker for movie producers to make a German out to be a bad guy than a whole population of white Americans. It's uncomfortable for Americans to think of their ancestors to be as viscious as Germans were during the Holocaust.
Movies are a representation of the culture in which they are produced.
They can tell a lot about what the population is ready to accept and what the population fears. For instance, we have become much more accepting of Vietnam movies since the late 80's. Before this time, the American population was not ready to see on the big screen what really happened in Vietnam. The Jewish people have refused to forget the persecution they have endured, from enslavement in Egypt to genocide in Europe. African-Americans, it seems, have developed a shared amnesia.