There's too much shouting down of stuff people don't want to hear these days - despite what CP points out, the guys comment is reasonable and pretty inarguable I'd say. As a nationality, poles suffered more than any other from the twin manias of nazism and communism. But the chap in question doesn't seem to me to be making any general comments about poles, just acknowledging the nazis had henchmen as did the communists and any occupier (as jockney says).
It's not like the kind of tosh that got not actually terribly bright 'national treasure' Stephen fry into a similar stooshie;
""Let's face it, there has been a history in Poland of right-wing Catholicism, which has been deeply disturbing for those of us who know a little history, and remember which side of the border Auschwitz was on,"
In which he revealed how very little he did indeed know about history, as auschwitz was the slaughtering grounds for countless people in his category, who the nazis hated as much as fry does, and was used for it before it was turned to the extermination of the Jews. This kind of cretinism from a self styled intellectual, which does indeed attack the poles as a people, is the kind of thing that justifies a reaction but it's wholly different to the fbi guys comments.