The nations were not sane—rational, composed, aware, but not sane. In each nation, the arsenal included potent distrust and even hatred. 

Greg Bear, Eons

Umberto Eco on nationalism

National identity is the last bastion of the dispossessed. But the meaning of identity is now based on hatred, on hatred for those who are not the same. Hatred has to be cultivated as a civic passion…. You always want someone to hate in order to feel justified in your own misery.

Umberto Eco, The Prague Cemetery

No beast has essayed the boundless, infinitely inventive art of human hatred. No beast can match its range and power.

Arundhati Roy, The God of Small Things