Like I said in my other reply - if 60 million(5th of current population) instead of 3000 people died in those attacks, I strongly believe even US would reconsider such position.
If your values change based on the magnitude of an atrocity then I suggest considering whether you hold those values at all. I certainly feel for the Polish people and the extreme suffering endured in the 20th century. But in my experience, suffering builds resolve, and it may jus be that Poland does not consider free speech a fundamental right. My homeland doesn't either, much to my disappointment.