zahavasdad – here we go again.
Why do you assume that because the result was not to your liking, that the decision must have been wrong ?
Do we need to go thru the lists again, of Gedolim who were clearly aware of the true situation in Europe and still didn’t say to leave ?
R’ Shach would say over a story from… perhaps R’ Chaim, I don’t remember. Guy had a dream that he drowned while crossing a certain bridge. R’ Chaim told him to ignore it, as we pasken that we don’t listen to dreams [please: the psak is not the point]. He repeatedly had the dream, and he kept giving him the same pask. He traveled over that bridge… and drowned! Family came to R’ Chaim, obviously upset. He told them: My psak was correct, and I would do the same even after having this knowledge!