How will Japan avenge its experiences of Hiroshima & Nagasaki, USA melting babies & 250,000 vaporized alive?

If you believe that the figure you refer to is atrocious in terms of lives lost, perhaps you should consider the number of people that were killed in Japan's aggressions prior to the United States being drawn into that war. China and much of Asia suffered much higher tolls than Japan. Japan did manage to emerge from the war as an economic powerhouse, capturing large portions of America's capacity to create wealth, and so in a way you could say that they did avenge the bombs somewhat. But Japan is dedicated to peace and maintains only the defensive capacity to rebuff an attack. It does not possess or seek to possess aggressive forces or weapons.