One could argue Eisenhower.
He dropped 2 nuclear bombs on civilian cities that happened to support war production in Japan.
Incorrect, wig. Eisenhower was commander in the European theater, not the Pacific theater, and had nothing to do with the decision to drop bombs on Hiroshima and Nagasaki. In fact, he stated that doing so was unnecessary since Japan was going to surrender very shorty without the bombs being dropped. Gen. Leslie Groves was the military official who pushed to drop the bombs. Truman dropped the bombs to prevent Russia from gaining strategic advantage by entering the Pacific theater so late and getting significant territory in Eastern Asia.
In support of that hypothesis that the atomic bombs did not prompt Japan's surrender, the United States bombed every other city in Japan for two years and that did not force a surrender. For crying out loud, we napalmed Tokyo - a city made of wood and paper - on March 9-10, 1945, killing 100,000 and leaving about a million homeless and Japan did not surrender. Japan surrendered after their talks with Moscow failed to achieve an agreement by the Russians to stay out of the Asian theater and after Russia attacked Manchuria on August 8, 1945. Japan knew it was over then.