The problem of Versailles peace was that it created oppressive states where minorities turned into second class citizens by law and by the practices of new countries. It may seem an absurd, but pre-Versailles empires were treating minorities much better because empires weren’t national countries. Once division of citizens according to their ethnicity began, it was the beginning of the end of large number of peoples who have remained in harsh custody of brutal ruling majority.
Life of minorities in the inter-war Poland turned into a nightmare: more than a million of Germans have been forced to emigrate, German minority was exposed to harsh ethnic discrimination, Poland has introduced anti-Jewish laws similar to these implemented by the Nazis. Jews have been persecuted in the worst possible manner. Other ethnic minorities shared the same fate. They have been imprisoned in the Fatherland which was Fatherland just for Poles.
It is indeed sickening that pogroms against the Jews have continued in Poland long after the victory – that dragged into 1946 and perhaps longer in a hidden way. Many Jews have died in Poland after the of the death camps have been deliberated and closed – from the Polish hand. Versailles has started that and Potsdam has culminated that into an extreme.
I would refrain from commenting the fate of Germans on Polish soil after the fall of the Reich. It was much more than sickening. Instead, I will cite J. R. Rummel, Professor Emeritus of Political Science, University of Hawaii:
Over a million Ethnic Germans and Reich Germans in or from the new post-war Polish territories likely died, 1945-1948. They were killed directly, or died from starvation, disease, exposure, in concentration camps, or during or because of their deportation to Germany. Since these deaths were outright murder, or because conditions were forced on these people that would likely result in their deaths, this was democide. How many died will never be known, and it is even doubtful that we can come within several hundred thousand of the true total. As I often point out, the most thoroughly studied figures for the Holocaust, and with scholarly access to the relevant official archives, the best estimates of Jewish deaths still differ by as much as 41 percent.38. This is to say that such democide surely took place, but experts and scholars can legitimately disagree as to the number.
The more critical question is whether the Polish governments, 1945-1948, were responsible for the democide. The answer is yes, on several grounds. One is that there was a functioning and internationally recognized Polish government administering new Poland, and although the Red Army had an overwhelming presence, the government was not fully communist, and could and did in many ways operate independently of Soviet wishes. Second is that even were the Polish government under full Soviet control, the Polish government still, according to international law, could not be excused from responsibility for the orders it carried out. Finally, with the collapse of communism in Eastern Europe, trails have been held and former communist officials convicted and punished for their crimes against humanity and human rights while in office. If anything established the point, this does: Polish post-war authorities were responsible for the German ethnic cleansing and resulting democide. And thus this massive democide can be attributed to the Polish government of the time.