So lets say the father (or, more likely, grandfather) of the person you are talking to, DID in fact commit crimes during WWII. What would that mean for the son/grandson? Can you inherit "guilt". Is the son of a muderer guilty of murder? Is not the notion of guilt itself something which is necessarily personal?
Israeli soldier lightly wounded after being hit by car south of Hebron (Haaretz)
from the article: Poll: Israeli Jews still don't forgive Germany for the Holocaust