Two things: First of all, the antisemitism of the Roosevelts should be compared to the bitter racism of Woodrow Wilson, who brought segregation to Washington, D.C.
Second, I read in the memoirs of an broadcast journalist that at the time of FDR’s death he was working at a radio station as one of its two employees, playing music for the station. Working by himself that day, he got a phone call from the other employee telling him of FDR’s death and that he should interrupt the music to give an announcement.
After making the announcement, he went back to playing music, not realizing that the song he was playing was, “I’ll be glad when you’re dead, you rascal, you!”
One of the more egregious errors of FDR in 1942, was to put thousands of American citizens (who happened to be Nisei Japanese) into US concentration camps and allowing private citizens and states like California take over all their property, homes and farms. The camps were terrible places where the men, women and children lived in tarpaper shacks, behind barbed wire fences guarded by US troops.