I think they, unlike the author of this piece, understood that nobody is their keeper. FDR was no more to blame for their travails than any other US president was to blame for fate of the genocide victims of any other ethnic or religious group during his watch. The blame lies squarely on the perpetrators of those genocides. Neither Israel nor the US is responsible for taking in large numbers of potential genocide victims and no amount of rationalization or parochial argument will foist that responsibility upon them.
Citizen s have the right to bring their relatives here, especially in a dire emergency. The Roosevelt state dept denied them entry because they were Jews.