Poland refuses to restitute Jewish property

There is a bitter dispute about the restitution of formerly Jewish property in Poland. The Polish, as one man, are against giving back a zloty to the legal inheritors of Poland's 3 million strong Jewish community before WWII. While most of the Jews, like the Poles, were penniless and starving, much of the urban property and factories were owned by Jews.

The argument is that the Polish people was itself a victim of the Nazis, so the Jews should go and demand Hitler. While it is true that for the Nazis, the Poles were second class subhumans (the first class being the Jews) and they pitilessly decimated them, the Poles themselves were no friends of the local Jews. Let us not make moral judgments of peoples condemned to death and being exterminated as were the Poles and Ukrainians too. The expropriation of the Jews and their expulsion is a recurring theme in European history: France 1200, England 1300, Spain 1495, etc.

An interesting question is if the five years Nazi rule did reduce the average IQ of the Poles and Ukrainians. The SS Aktion groups had orders to kill all the Jews and all the local intelligentsia such as Communist commissars, priests, teachers, and potential leaders. The Soviets followed by killing the Polish officer class. Poles and Jews lost about the same absolute numbers. How many IQ points the Poles lost as a result of this selective extermination? Considering the difficulties faced by Poland and Ukraine to reach their pre-WWII economic and intellectual output, as compared with similar like  Hungary, Czechoslovakia, Eastern Germany, that did not suffer the same policy, it makes sense to suspect that they lost some of their mojo. It does not make me happy, I feel their pain, their loss is a loss for all humanity.