From what I have read from the internet and school, it seems the blame is on his generals not Hirohito specifically. However I still believe that he is responsible for all the nasty blam that happened under the Japanese occupation. It warps reality that they didn't try him as a war criminal, it would be if Hitler said "I didn't murder the Jews, my generals did". Alas there are cases like this all over the world more specifically former members of the Khmer rouge......