They were nazis, who cares?
They were human beings who were victims of their society and government just as much so as the prisoners they watched over.
That's a disgusting thing to say.
While there is something to what Libertas says (war victimizes the non-politicians on all sides), I do find it rather disturbing to suggest the guards were as much victims as the prisoners. Whether that is more disturbing than the suggestion that nobody should care about the killing of another human being because of that person's affiliations, I don't know.
Consider what the nazis did to complete innocents. This was simply justice in the fast forward method. Was it slightly unethical? Perhaps. Was it unjustifiable? Hell no. War is hell and for all the much more horrific crimes that were committed by the Nazis and Japanese what the US soldiers did was mild in comparison.