Thank you for sharing your thoughts and words on this. I can only imagine the horror and depravity your grand-father saw. Don’t let those who deny what transpired in WWII bring you down.
Hopefully your grand-father has shared his thoughts on what happened to him. If not he, or you, should put it down on paper.
I had two uncles fight in the European theater. One wounded in late ’44. Both men were obviously haunted by the war and used the bottle as a method to cope. As a result both died relatively early and never put down any of their experiences down on paper. I wish they had.