The lack of objectivity, as far as foreign nations are concerned, is notorious. From one day to another, another nation is made out to be utterly depraved and fiendish, while one’s own nation stands for everything that is good and noble. Every action of the enemy is judged by one standard — every action of oneself by another. Even good deeds by the enemy are considered a sign of particular devilishness, meant to deceive us and the world, while our bad deeds are necessary and justified by our noble goals which they serve.

Erich Fromm (1900-1980) American psychoanalyst and social philosopher

The Art of Loving, ch. 2 (1956)