Does war justifiy the actions of a person ?

Time and time again we see that the ss officers are ruthless and they beat and kill women, men and kids that they don't like we see this because they are suppose to be the "killers" of Nazi group. But we see that there are some SS soldiers and officers that abuse their power like Amon Goeth that liked to take advantage of women and kill people. And even as bad as he seemed he was still able to be changed by Oskar schindleir because Oskar was smart with his words, but did that mean that he was still justified for all the bad things he did and was still doing? Like what oskar said to the girl in the wine cellar, the war brings the worst out of people and we see that this is the case for many of the SS officers and soldiers. But war shouldn't be an excuess to just go out and kill people that are innocent because you feel like it. Now I know that there were a lot of soldiers that didn't want to do all this and they didn't want to participate in the war but when they fell into influence they did what they were told or some feared what could happen to them. But i guess the question is who should be accussed of what is happening or who should be let off. In the justice system not everyone is going to get justified and the people who judge the accused have choices to make with a set a rules that sometimes don't prove that the accused are wrong for what they are doing or what they have done.