In my case, when I read "Crisis of Conscience" for the first time I was a fanatical Witness Apologist. So, though I admitted to myself that Ray told some truths, I did not want to leave the organization, because I wanted to believe that witnesses are the only ones who want to follow the Bible teachings. In fact, the book which shocked my faith in the organization was "Apocalypse Delayed" by James Penton. This book motivated my research in the history of the organization, so by this I could discover that Rutherford was an evil man. So I went back to "Crisis of Conscience" and I had to admit that Ray was totally right. Then I read "In the Search of the Christian Freedom", then other books like these. I think that the force of the beginning of internet was stronger than "Crisis of Conscience". At least, in latin countries, the books of Ray are not available, so, without internet, many in the latin world would still ignore TTATT.