" If we have thus come to a fresh understanding of our estranged fellow citizens we can more easily bear the disappointment which nations have caused us, for of them we must only make demands of a far more modest nature. They are perhaps repeating the development of the individual and at the present day still exhibit very primitive stages of development with a correspondingly slow progress towards the formation of higher unities. It is in keeping with this that the educational factor of an outer compulsion to morality, which we found so active in the individual, is barely perceptible in them. We had indeed hoped that the wonderful community of interests established by intercourse and the exchange of products would result in the beginning of such a compulsion, but it seems that nations obey their passions of the moment far more than their interests. At most they make use of their interests to justify the gratification of their passions.

It is indeed a mystery why the individual members of nations should disdain, hate, and abhor each other at all, even in times of peace. I do not know why it is. It seems as if all the moral achievements of the individual were obliterated in the case of a large number of people, not to mention millions, until only the most primitive, oldest, and most brutal psychic inhibitions remained.

Perhaps only later developments will succeed in changing these lamentable conditions. But a little more truthfulness and straightforward dealing on all sides, both in the relation of people towards each other and between themselves and those who govern them, might smooth the way for such a change. "

― Sigmund Freud , Reflections on War and Death