Nor should he have ever stood trial. He was their God king, their living Saint and MacArthur was right to oppose the symbolic obliteration of Japanese Culture by deconsttuctivist forces, especially when two allies were even worse.
I don't believe in reparations, to anyone or any nation unless it's to the survivors and when the last of those die, the aggrieved no longer exist, it becomes a political attack on the group or nation in question.
Japan was arguably worse than Nazi Germany but as long as the US was allied with Stalin and Mao they had no right to force either nation to destroy their cultures to attone for a war whose total body count equals the internal body counts of two allies combined.