Here is a map of Japan before the bomb:

Japan took over half of Asia and in the process gave a new meaning to the word "ruthless". If you add up the death statistics from the populations of each of the countries Japan occupied, it would be certainly be high (China alone is bad), and would be worse if they didn't surrender. Lots of countries in Asia have a "when Japan took over" section in their national museums, all loaded with stories of the sick and twisted stuff (from rapes to the "bayonet the baby in the air" game) that was done to the local populations. There are lots of old folks still around in the Philippines, Singapore, Malaysia, Indonesia, Korea, and China who might choose to remember the 65th anniversary for a different reason. Its amazing that Hirohito and his upper echelon escaped any kind of war crimes tribunal.
At the time the bombs were dropped, Japan was in a much weaker position making the decision more tricky in terms of the total "lives saved" argument, as the Japanese had already enslaved, raped and murdered so many that it was arguably too late. Stopping Japan (by nukes or otherwise) around the late 30s would have saved millions throughout Asia. Hundreds of thousands in one city (Nanking) alone.
Anyway, I can't fathom the kind of crazy that took over the country back then, as it totally contrasts my views of modern day Japan. I travel there a bit and have a Japanese boss who's great, and it just baffles me.