In trying to understand the events of WWII and today, it is important to remember that Europe viewed the Bolshevik movement as Jewish and viewed Russia as the greatest threat to their own countries, whether by external conquest or internal revolution. Many in Europe viewed Jews as Bolsheviks and questioned their loyality. Many in America qudestioned the loyality of Japanese-Americans during WWII. Today Americans question the loyality of Muslim Americans.
The distinctions between these examples may be subtle but I think they are important.
Jews were indeed major players in the Bolshevik movement beginning with the German Jew Karl Marx who had only been dead several decades. The number of Jews associated with the Russian revolution was far out of proportion to their national presence with some estimates well above 50% of the party. This large "on the ground" role of Jews in the formation of Communism and their role in the ruthless destruction of Russia set a powerful regional example.
In the collapsed economy of post WW1 Germany the Communists were making serious revolutionary noises and again local Jews were major players. This despite the fact German Jews prior to the 1930s probably lived better and were more integrated into the host society than Jews anywhere in the world. While national "loyalty" may not have been the correct issue, there certainly was reason for concern that similar "Bolshevik" revolutions might devastate other European countries, especially Germany. It appears that a minority of activist Jews in Germany destroyed the good life of the majority by handing Adolph a ready-made issue complete with a spectacular example right next door.
This was not the case with Japanese-Americans, J. Edgar and FDR notwithstanding. There was little if any Japanese-American involvement with WW2 Japan, and their American loyalty was quickly proven. The loyality of Muslim-Americans has yet to be established.