Hitler's aims toward the Polish people was clearly genocidal. After 50 years of National Socialism Poland would have been a nation of model Aryan communities, and what Poles remained would have resided in slave labor camps. They suffered under both regiemes, imo the idea that they would have been "better off" under Hitler demeans that suffering
In reading the actual column, I didn't get the impression that he was arguing "better off" with Nazis; the impression I get is that he was saying, "lost of good lives were lost, yet it didn't save the Poles from having to endure tyranny--one was replaced with another"...it seems that we all went home with a "victory"--having successfully struck back after a surprise attack against us--but it was not really much of a victory for the Poles. In fact, the columnist is rather sympathetic toward the Poles' plight...
I think that people who complain have quite a prejudice against the author or else just believe that only Americans matter, and those Poles and Jews and Latvians, etc., are nothing.