Genocide has been part of the human experience since at least records started being kept. Our consignment of Indians to the most barren lands wasn't precisely genocide, but it wasn't a walk in the park for them, with many dying from malnutrition-induced diseases, starvation and exposure. There were also other genocides during the 20th century in response to which we did even less than we did for the Holocaust. We did not go to war over either the Armenian or Ukrainian genocides, and we certainly did not hold war crimes trials for the perpetrators of those atrocities.
None of which applies to this particular comment or the article. The US at the time was supplying war material to the Brits and others fighting the Germans.. Roosevelt sent a ship load (over a thousand) German Jews back to their certain death because of his dislike of Jews AND his general uselessness as a president.
We are talking about roosevelt’s anti-semitic bent which was ( and probably still is) prevalent in the US.
Be sure and tell us all abut how kind the Chinese Communists are to their citizens