I became a JW because I honestly believed what I was taught, that was in the 80s, there was not Internet to research things then. All the years up until the end of last year I did not consider it necessary to research anything, because the indoctrination is such that one does not need to research these things because the Watchtower does it for you and presents you with the truth. So that's the indoctrination and you believe it.
When, after researching a non-doctrinal aspect of JWs, how much money they have, I stumbled on the Candece Conti case, that was the first domino. The facts about the Watchtower and its toxic teachings hit me thereafter like being constantly kicked in the balls.
As it is very unpleasant to be kicked in the balls, that could be the reason why the facts do not affect JWs, because they are protecting their balls. This protection mechanism is call Cognitive Dissonance (CD), every single person alive is affected in one way or another by this, to deny that is proof in itself. CD is not a disease or an illness, it is a protection mechanism that everybody has, it can be beneficial, but in the case of being and staying in a cult as with JWs it is certainly not. Understanding the mechanisms of CD is an aid in releasing the bonds of the cult.