America isn't to blame. They are Jews who are ashamed to be Jewish, and America is a place where nobody has to be what they don't want to be. All the lefty Jews can assimilate to their heart's desire and the Neturei Karta judenrats can promote their anti-Semitic filth.
It's simply just the opposite end of a spectrum. Right wing Christians, Jews, etc can be that way and lefty scum can be another way. The land of the free, home of the brave.