I met an holocaust survivor, who was a distant uncle of a friend. He was travelling from Poland to Switzerland, at the beginning of WWII. Two German soldiers checked his passport, which had a "Juden" mark. He was lucky, for some reason, they didn't arrest him. He overheard one saying to the other "you should never trust Jews". Later, after much travel through Europe, he and his father got caught and put in a transit camp in occupied France. The French policemen who guarded it told them "we're not watching; the gate is open". The father didn't want to escape, as he still believed in justice: "I've never done anything bad! I'm innocent! I'm not going to run like a criminal!" He died a few months later in a concentration camp.
The son died shortly after telling us his story. He had never told anybody about it before. He had tried all his life to forget it, to no avail.