I do issue this warning again, You might find out things that you didnt want to hear or wont belive are true.
Most people who write history are biased, and they will usually write their accounts from their own perspective and frum authors are not exempt.
One has to understand why jews were into =isms prior to WW II and zionism was not even near to the most popular (yet many frum authors seem to harp on this when Bundism which was secular socialism seems to be omitted and it was the most popular philosophy) , One also has to understand why in the Ashkenzic world the word of the local Rav was not obeyed . Why were jews attracted to the haskallah , Communism , Bundism and moving to the USA. These questions are very important to understanding pre-war Europe.