Bergamini laid a very rational argument for Hirohito being chiefly responsible for Japan's aggressive war policies. Naturally, the Allies were eager to have a subdued Japanese population after the war and let Hirohito off the hook.
No but if you're interested try "Hirohito and the Making of Modern Japan" by Herbert Bix, probably comes to the same conclusion re Hirohito's involvement in the wars of 1930's and 1940's.