Perhaps, they don't realize the amount of resentment some Jews have towards Poland.
Einstein did develop as a person in Germany. I believe before the Nazis came to power, he was uninhibited in his career. His most famous articles were published in the begining of the century. Or are you counting Jews separately in every country? If you do so, then the question why there is "anti-semitism" has its answer right there.
And to your question why it is "nazi", you didn't ask that question when being pointed out how many Jewish Bolsheviks there were in Lenin's government.
It is a well-known fact that Jews in Eastern Europe, including Poland, were never considered citizens of the countries in which they lived. It seems to me that, if the country in which they lived did not give them full citizenship, and in fact, did its best to drive them out, that country has no right to claim credit for their accomplishments.
Or are you counting Jews separately in every country?
The United States is a completely different situation. Jews have full citizenship here.