Attitudes to Jews in the 1930's (which is what your link refers to) and attitudes in the 1940's (especially postwar) were very different (in Australia and elsewhere).
Do you have any evidence for that? Later, the Occam's Razor talk mentions that Popper applied again in 1945, with the same result. I assume the allied public changed its mind very rapidly when the war ended, and it learnt about the extermination camps.
(Although most articles discuss it on a country-by-country basis)
..nearly every survey of antisemitism taken after 1946 showed a rapid reduction.[39] It is impossible to determine precisely to what extent knowledge of the murder of six million Jews contributed to this change.
In the aftermath of the war, non-Jews tried to avoid expressing prejudicial remarks. To the question “Have you heard any criticism or talk against the Jews in the last six months,” the answers showed a decline, with the most significant changes occurring from 1946 to 1951. In 1946, 64 percent responded positively whereas in 1950 only 24 percent did so.
..the new president Harry Truman viewed the question of the million European refugees who had survived the war and who opposed repatriation to their country of origin as a "world tragedy".[42] Thus, he slowly encouraged the United States to take the lead in seeking a solution. Among the Displaced Persons, about 20 percent were Jews who languished in displaced persons camps in Germany, Austria or Italy, waiting for emigration visas.[43] However, no country was willing to admit them in large numbers.[44]
Antisemitism in the United States began to decline in the late 1940s. As they became aware of the Holocaust, many Americans found themselves ardently opposed to views which had been used to justify such genocide.
Possibly as a belated compensation for the thoughtless mild anti-semitism in Catholic and labour movement circles in the pre-war period, Calwell (Labour party minister) became quite a determined and resourceful sponsor of Jewish immigration in the immediate postwar period. A very widely publicised incident was that Calwell and the government actually connived at the chartering of several ships specially to transport Jewish migrants, although some other migrants were brought on these ships as a kind of camouflage, in the face of the anti-Semitic hysteria being whipped up by reactionary Liberal politicians
after 1946 ... late 1940s ... immediate postwar period. These sources contradict your claim, and suggest that both America and Australia were disgracefully antisemitic when Oppenheimer wrote his letter.
I'm not really disagreeing with you, just pointing out that by the late 1940s attitudes had changed. It seems likely that process was gradual as people learnt what had happened in Europe.
Given that Oppenheimer was Jewish himself I suspect his comments probably were more about Feynman's character compared to other physicist rather than his religious and cultural background.
