Did President Truman Ever Regret His Hiroshima Decision?

Seventy-five years ago this week, President Harry S. Truman exulted when he heard the first report that the atomic bomb he had ordered dropped over Hiroshima, Japan, by a B-29 bomber, had exploded as planned and on target, most likely devastating most of the large city. Truman was on the ocean, returning to Washington from the Potsdam Conference in Germany, where he had secured Joseph Stalin's promise to declare war on Japan around August 10. An article in the press the day after the first atomic attack depicted Truman, his voice "tense with excitement," personally informing his shipmates about the...