I completely understand your justified angst. My spirit is stirred and ill at ease at these stories. My heart swells with sadness at your stories. It is horrific.
If it means anything to you, my family served in WW2 proudly, and believed Jewish people to be good people.
It actually cost my Father as well, as he lost his family in upheaval- and grew up without a Father, because of the war. Hitler was a horrible criminal against humankind.
I never learned anything other than that. That is a heavy, heavy pain for you. I am so sorry. I would like to pray for your whole family, that you have a blanket and covering of peace and understanding.
I go to a temple tonight and observe Hanukkah, and I think Jewish people are beautiful. I honor your grandparents and loved ones, and all of your people.
G*d bless you.
Peace be with you, too, and thanks again.