” He had a bunch of Jews working for him in his command yet he was killing Jews too.”
Sorry. No great fan of FDR, but he did not kill a single Jew. He neglected to save Jews, might have been anti-Semitic himself, but let’s make a clear distinction here between acquiescing to the evils done outside of the US borders and committing those evils himself. He did not lift a hand to save Jews outside the United States, but that is not murder, just neglect to save. The British pressured neutral countries to refuse to receive Jewish refugees, for fear they would end up in Israel (see Struma for most egregious example). That was considerably worse than FDR, but still not murder. Who were the murderers? Germany and its direct collaborators. Stalin for what he did to the Jewish partisans. Period. End of story.
None of the Germans tried in Nuremberg (personally) killed a single Jew! Just like FDR, who enabled Stalin to commit his crimes.