Because at that time Stalin had not called for wholesale destuction of the Jewish race and Hitler had. When Stalin called for slaughter of the Soviet Jews in the early 50’s G*D killed him.
Moronic.
The Soviets slaughtered millions of all sorts and creeds before Hitler ever got close to sniffing power.
And if you think G-d works so quickly on behalf of a specific group, well, he sure didn’t help very fast in Germany.