The book, The making of the nuclear bomb, talks of people walking in the streets with skin hanging from their face and arms. A gentleman holding his own eye. They talked of 100s of people running into the river due to severe burns only to die just moments later as they recovered from the shock.

People were permanently blinded, the hospital infrastructure was destroyed, so the many who were in severe pain could get no help. And of course there were the cases of accute radiation syndrome.

The Nuclear bomb is a terrible instrument of war. And of course, it's chief purpose is demoralizing the enemy, or to put it differently, killing civilians.