I would expect that if you are a German you might remember your grandmother or mother or others telling you about the behaviour of the Red Army post-WWII. Whereas in countries such as Poland women had some protection (although outside towns there was still a free for all) in Germany no such protection was given. Stalin basically told commanding officers to look the other way. Not really discussed these days but well documented nonetheless.
I’m surprised that you don’t feel your part-Polish neighbour might have a point given that Poland was occupied by Soviet forces during and after the war and then for the next decades labelling themselves as “liberators”. Between 1-1.5 million Poles were taken by Soviet forces in the middle of the night and deported in cattle wagons to far reaches of Siberia in 1940/41.
It was also partitioned by Russia, Austria and Germany in the 18th/19thC and completely disappeared off the map of Europe as over the course of 70 years more and more was eroded. It only reappeared post-WWI
So your neighbour’s father’s family had some experience of what can happen if you do have too much trust.