cantoresq,
Which Rabbi(‘s) advised anyone who had the means to leave (visa, available transportation, etc.), not to leave Europe? And on what scale (wholesale, individual)? Specifics, times, and sources please. (Especially sources.)
Since you made such scurrilous allegations, I would expect you already have this information.
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There is a famous letter from R. Elchanan Wasserman to a yeshiva student advising him not to leave Europe, where he would die a mere physical death, and emmigrat to america where he would die a spiritual one.