Like many of my colleagues from the 511th MI Company, I visited the Dachau Concentration Camp during my tenure in Fulda, and it was a sobering experience. It is difficult for any rational individual to come to terms with the sheer magnitude of horrors that took place in that single camp. On that note, I just read the following article from HistoryNet, which describes the retributory actions of US soldiers during the liberation of Dachau:
I have to admit, I find it difficult to find fault with soldiers who retaliated against the guards that were still defending the camp when the US Army arrived. It is easy during a time of relative peace to passively judge the actions of soldiers who exacted vengeance upon unarmed guards several decades ago, and it is likewise easy during peacetime to believe that any of us might have behaved differently in a similar circumstance. Nevertheless, none of us trod the path those soldiers walked, and I am willing to bet that coming face to face with Dachau's camp guards - whom we now perceive as inhuman monsters - could alter anyone's sense of morality.
ADDITIONAL REFERENCES:
More information about the Dachau Concentration Camp and the reprisals that were taken by US soldiers is available in the following WikiPedia articles: