Anything said before WW II must be taken in context, Whatever was said before the war , opinons charged after the war
Gedolim forbid leaving Europe for either The United States, Israel (And even Great Britain) before the war and obviously after the war they changed their minds.
There is no way to know if comments for example by Rav Elchanon Wasserman before the war would have changed his miond after the war. for example The Munchatcher Rebbe was a fierce anti-zionist, but after the war his son seeing the carnage seperated himself from Muncatch because he felt zionism was the correct path.
The Satmar Rebbe himself forbid his followers from leaving Hungry before 1939. Obviously after the war he changed his mind.