After what the japanese did to my people, and other peoples around Japan, in that time means they got off easy.
Not saying the current japanese should be punished, but lets not pretend what the americans did to stop a force of evil like that was in any way, shape, or form a warcrime.
It was that or invade the main land and end up with way more death civilians. (Because other japanese islands that where freed had massive rates of japanese women and children killing themselves because they were taught that the americans would unalive and worse them).