Are Polish people forgetting that our ancestors killed their ancestors 500 years ago? when they tried invading Europe much like they are now, and imposing their way of life.
Well you can take the UK or US approach and just let them impose their way of life through political correctness. Let them adhere to shariah law instead of the Constitution in America. Encourage them to migrate freely into your country, then violently protest Osama's death in the UK. The biggest threat to people in the UK are from Muslims born in the UK, not Pakistan or other places.
I don't know the Polish people. (If I am wrong on my Polish history in this next part please forgive me, If you know of any books in English that would help explain Polish history please let me know) I know that for a long time, Poland was not on a map. The Polish superpower was destroyed for doing something so simple like giving rights to its people. If Poland wants to adopt Communism or Socialism today, then I don't care what happens to it. It deserves what it gets. But if Poland fearlessly, like I imagine it once did, adopts policy of giving power to the people of Poland (assuming the majority of them embrace freedom) then the only thing you have to worry about is how popular Poland becomes.
We live in a world where you can be from Pakistan, Iran, Egypt, UK, but all the extremist (or the general population) from these countries want one thing, that other nations convert to Islam. They're not interested in the language you speak or the color of your skin, they are interested in you adhering to their ideas. Poland needs to take a stand on what the people believe.
So ethnic Polish, Polish in origin, I do not know. Poland and the Polish people need to decide on what they believe. You want communism and socialism, then don't waste my time. If you know what makes Poland Poland, then I would love to listen. I would love to learn the history and culture of a people on the other side of the world if they embrace the goodness which is freedom. If not then I could only resent you.