Lanterns, some of them with antinuclear messages, were released Saturday in Hiroshima. Survivors of the atomic bombings hope to use their moral standing to wean Japan off nuclear power.Credit...Kim Kyung-Hoon/Reuters NAGASAKI, Japan — In 1945, Masahito Hirose saw the white mushroom cloud rise from the atomic bomb that incinerated this city and that left his aunt to die a slow, painful death, bleed