Gavra, you put “chochom” in quotes. I don’t know to whom you refer, but I can assure you that I am more discerning as to who possesses “daas Torah” than it may appear. I am discussing the principle.
There was no way for Da’as Torah to know the future, as they are not Omniscient. As such, they reasonably believed the people were safe (which they weren’t).
Alternatively, understanding that the Holocaust was a Gezairah Min HaShomayim, Hashem blocked the “Einei HaEidah” from seeing what the potential danger was, as part of His master plan that needed the Holocaust (and all of the deaths) to happen.
Both. Also, as simcha 613 posted earlier, there was a ruchniyus aspect to the decision, and that may have been balanced into the decision (although I doubt it could have been the sole deciding factor).