I maybe misreading you, but let's not give Roosevelt and his administration a free pass for flubbing multiple opportunities to save endangered European Jews.
I'd respectfully suggest that you try to obtain a copy of "While Six Million Died: A Chronicle of American Apathy," by Arthur D. Morse, originally published in 1967. There was also a paperback edition. It's a well-researched history of American government failures to save European Jewish refugees, by not following up on and not supporting rescue plans which could have saved lives without compromising the war effort.
The existence of death camps in Poland was well known to Roosevelt and others in the Administration by August of 1942, based on information supplied by representatives of the Polish government in exile. There was even a German businessman/spy with inside info from top ranking Nazis who courageously leaked the Nazi genocide strategy to the World Jewish Congress in neutral Switzerland, from which it was transmitted to the US.
They knew, yes, they knew but they were not about to divert “War Effort” resources to save millions of Jews, besides FDR are and many centers of power in Washington, London and Paris didn't really care for the Jews anyway.
You stated:
...by not following up on and not supporting rescue plans which could have saved lives without compromising the war effort.
The FDR administration felt the exact opposite. Diverting resources to bomb concentration camps meant US/British bombers being shot down NOT on a mission to knock out the Schwienfurt Ball bearing factories but for “Humanitarian” purposes? Sorry to be so cynical but even today after the Holocaust nations follow their interests even if that means millions die.
No, even the British who could have opened Palestine for the flood of Jews appeased the Arabs (yes, Arabs, long before they decided to call themselves "Palestinians", read PLO).
Nobody wanted the Jews and the case is still the same only now, nobody wants the State of Israel to exist and flourish, which she does.
The Israelis take a good long look at what is happening all around them and they know, for not the Israel Defense Forces and American aid (which Obama gives reluctantly) they would be slaughtered in a way that is happening in Syria today.