We are all capable of believing things that are not true, and then when we are finally proved wrong, and imprudently twisting the facts so as to show that we were right.
It is possible to carry on this process for an indefinite time, the only check on it is that sooner or later a false belief bumps up against solid reality, usually on the battle field George Orwell.
Illegal laws will not affect my life, but it will affect the oath breakers.