There are some black marks in history that are difficult to erase, and then there are those that never should be. With the atrocities that happened in so called Concentration Camps (or Death Camps), we should never forget these things. To forget would be to disrespect those who were imprisoned there, and it would risk the chance of repeating itself if we did not learn from our past.
I learned that a friend of the family had been imprisoned at Dachau and was among those released when it was taken over by the Allied troops. He was given potatoes by them, and remembers it as the best meal of his life. Unfortunately though there were just too many who didn't make it to freedom: in fact, there were stories of many people who died the day before the camp was liberated. Surprisingly, there were also stories of even worse death camps -- in the exhibit, it had quotes saying that some people prayed to be sent back to Dachau. Of course, only very few people ever escaped. When the camp was freed from SS control, the troops took the people of the town of Dachau and forced them to walk through and witness the atrocities that took place there (as there were still bodies piled high). I was glad to hear that the Americans made them do that -- living next to such a place and not seeing the forest for the trees? Kind of unbelievable.
To be honest, while we learned about the SS and the Nazis I kept on thinking about the movie 'Inglourious Basterds'.