http://www.jewishvirtuallibrary.org/jsource/Holocaust/march.html
...So it was that on October 6, 1943, more than 400 Orthodox rabbis, accompanied by marshals from the Jewish War Veterans of America, marched solemnly from Union Station to their first stop, the Capitol. Vice President Henry A. Wallace and a large bipartisan delegation of Congressional leaders received them. While passersby gawked and newsmen snapped photos, the rabbis recited the Kaddish; sang the traditional Jewish prayer for the nation’s leaders to the tune of the “Star Spangled Banner”; and solemnly read aloud, in English and Hebrew, their petition calling for the creation of a special Federal agency to rescue European Jewry and expand the limited quota on Jewish refugee immigration to the United States. Time Magazine commented that, on receiving the petition, Vice President Wallace “squirmed through a diplomatically minimal answer.” The rabbis then marched from the Capitol to the White House.
On the advice of his aides, FDR, who was scheduled to attend a military ceremony, intentionally avoided the rabbis by leaving the White. House through a rear exit while they marched silently in front. When Roosevelt’s decision not to encounter the rabbis became known to the press, reporters interpreted Roosevelt’s actions as a snub, adding a dramatic flair that transformed the protest rally into a full-fledged clash between the rabbis and the administration...
So? What is this? By 1943 the US was already involved in WWII, on their way to invade Europe and end the Holocaust. This incident adds nothing to the argument,one way or the other.