Smerel,
Those secular American Jews who sabotaged rescue efforts did so because they feared that more Jews would mean more antisemitism. They also feared that WW2 would be labeled a Jewish war.This was not without foundation. In a 1938 poll, approximately 60 percent of the respondents held a low opinion of Jews, labeling them “greedy,” “dishonest,” and “pushy.”41 percent of respondents agreed that Jews had “too much power in the United States,” and this figure rose to 58 percent by 1945. In 1939 a Roper poll found that only thirty-nine percent of Americans felt that Jews should be treated like other people. Fifty-three percent believed that “Jews are different and should be restricted” and ten percent believed that Jews should be deported. Several surveys taken from 1940 to 1946 found that Jews were seen as a greater threat to the welfare of the United States than any other national, religious, or racial group.
J Street and their ilk do not fear generally fear antisemitism (I suspect that many Jews on campuses who publicly espouse anti-Israel positions do so out of fear). They are ideologically opposed to any form of nationalism. I think that this is also why the Right is pro-Israel. In fact, one politician once commented that Netanyahu could be a Republican.. BTW, the feeling is so mutual that there was once talk of Netanyahu bringing the Likud and several smaller parties into an Israeli Republican party.