You just need to see Borat to figure out that many people in the States think this way too.
The difference is that the people in the U.S. that think that way ARE skinheads, militia types, the fringes of society, etc etc. Europe is hit on two fronts: the culture of anti-semetism that exists amongst university professors, journalists, and intellectuals, and the Muslim community, who have an inordinate amount of influence and power. It allows anti-semetic ideas to seep into the wider culture.
Question 8 is the one that shocked me, but gave me hope in a slight way. It shows that people really don't know how hellish life is for most Continental European Jews, which I suppose is better than knowing and not doing anything about it.
A closer answer would say "The problem is the culture where most anti-semitism is disguised as criticism of Israel, when rebuffed as anti-semite claptrap, these (usually) pseudo-leftists reply "OMG all criticism of Israel does not equal anti semitism" as of course no one wants to be labelled as an anti-semite, even if you do believe that a cabal of jews is running US foreign policy for example (an opinion not too uncommon over here, sadly)"
