Kenzaburō Ōe said this quote

We naturally try to forget our personal tragedies, serious or trifling, as soon as possible (even something as petty as being scorned or disdained by a stranger on a street corner). We try not to carry these things over to tomorrow. It is not strange, therefore, that the whole human race is trying to put Hiroshima, the extreme point of human tragedy, completely out of mind.