You are not responsible for the actions of your ancestors or relatives. In my case I knew I had German relatives, when I found them on my tree, I stopped there. I did not want to know if there were any descendants of this family and what they may have done in WW2. And so this branch of my family remained blank for many years. However my German relatives filled in the blanks for me on a Genealogical site. Three of them died fighting for Nazi Germany. They were not poorly educated, naive conscripts, all were officers. The worst of them was an officer in the Waffen-SS. The only good thing I can say about him is he got killed relatively early in the war in July 1941. His mother was English and that's how I ended up related to him, his slightly older English cousin was killed fighting for the English in WW1. It has taken me awhile to come to terms with this, and it's not easy. But I am not responsible for what my German relatives did. And you are not responsible for what your ancestors did. I am however responsible for my own actions and words, so I try my best to treat all people I meet equally, regardless of race, nationality, color, creed, sex, religion etc.
And that is the best I can do.