Why do you ask such question if you know very well that in EVERY country there are people who hate others?
The original nasty passage from the article is:
"this blood-soaked land, where Jews had been so ruthlessly hunted down and killed by their former neighbors and friends"
In EVERY nation there will be people who will collaborate with the oppressors and who will be traitors. It ALSO applies to the Jews who had many collaborators among themselves too.
But this passage does not express this universal human condition - it rather project the evil on the Poles and makes them into scapegoats.
"[...]There are meaningful warnings that history gives a threatened or perishing society. Such are, for instance, the decadence of art, or a lack of great statesmen. There are open and evident warnings, too. The center of your democracy and of your culture is left without electric power for a few hours only, and all of a sudden crowds of American citizens start looting and creating havoc. The smooth surface film must be very thin, then, the social system quite unstable and unhealthy.[...]"