That’s your opinion. Unfortunately, when the bishops did speak out against Hitler, the chief result was that more people were sent to the death camps.
Roosevelt, unfortunately, had an antisemitic streak. The most notorious instance has been novelized in Katherine Anne Porter’s Ship of Fools, when Roosevelt refused to allow Jewish refugees fleeing Hitler into the U.S.
Roosevelt and Churchill were perfectly well aware of the death camps, but they had other priorities. And both of them tended to be anti-Catholic as well as anti-semitic in any case. Churchill was only with difficulty prevented from bombing the Vatican during the Italian campaign.
Roosevelt, yes (though I suspect even he would have, albeit begrudgingly, supported saving the Jews, if for no other reason than to avoid ticking off his Jewish electorate back at home and thus avoid the possibility of losing the election during the war or even before then, had Wise actually told him instead of hid the information). I’m not entirely sure about Churchill, though. I heard the full version of his speech had him make clear that while there were Jews who were largely composed of the Reds, the Reds themselves were huge anti-semites, even pointedly stating that Trotsky’s Jewish heritage was the sole reason why he was not the dictator of the USSR, despite contributing massively towards the Communist efforts.
And yeah, the bishops had a bit of a reason to avoid talking. Especially if the reason amounted to laying low and ensuring more of their flock didn’t get killed. I have a bit more reason to forgive them for being silent over the likes of that sell-out Rabbi Wise. Even if I weren’t Catholic, I still would have said that.