The nationalist not only does not disapprove of atrocities committed by his own side, but he has a remarkable capacity for not even hearing about them. […] In nationalist thought there are facts which are both true and untrue, known and unknown. A known fact may be so unbearable that it is habitually pushed aside and not allowed to enter into logical processes, or on the other hand it may enter into every calculation and yet never be admitted as a fact, even in one’s own mind.

George Orwell (1903-1950) English writer [pseud. of Eric Arthur Blair]

“Notes on Nationalism” (May 1945)
    (Source)