If you really want to understand how 31 General Chapter members can contradict in 2012 what they declared in 2006; how almost all SSPX priests can look the other way as Menzingen contradicts the policy of Archbishop Lefebvre towards Rome; how they can fail to see a declaration against the faith in Bishop Fellay's April 15, 2012 doctrinal declaration; how Bishop WIlliamson became the bad guy; how the Resistance is disobedient; etc.
If you have wondered about these things, the whole answer is right here:
Crimestop
Crimestop is a Newspeak term taken from the novel Nineteen Eighty-Four by George Orwell. It means to rid oneself of unwanted thoughts, i.e., thoughts that interfere with the ideology of the Party. This way, a person avoids committing thoughtcrime.
In the novel, we hear about crimestop through the eyes of protagonist Winston Smith:
The mind should develop a blind spot whenever a dangerous thought presented itself. The process should be automatic, instinctive. Crimestop, they called it in Newspeak.
He set to work to exercise himself in crimestop. He presented himself with propositions -- 'the Party says the earth is flat', 'the party says that ice is heavier than water' -- and trained himself in not seeing or not understanding the arguments that contradicted them.
Orwell also describes crimestop from the perspective of Emmanuel Goldstein in the book The Theory and Practice of Oligarchical Collectivism:
Crimestop means the faculty of stopping short, as though by instinct, at the threshold of any dangerous thought. It includes the power of not grasping analogies, of failing to perceive logical errors, of misunderstanding the simplest arguments if they are inimical to Ingsoc [or Menzingen], and of being bored or repelled by any train of thought which is capable of leading in a heretical direction.
Crimestop, in short, means protective stupidity.
(Taken from Wikipedia)