People can justify almost anything. That's why history keeps repeating itself.

from something I read

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

According to Keynes

Uncertainty about the future—not irrationality or stupidity—makes crowds prone to calamity in both finance and politics, particularly under conditions of significant anxiety. Markets are no more self-correcting than a mob hailing a demagogue.

Zachary D.Carter in The Price of Peace