The reasons why the bombs should have not been used on Japan are because the already lack of war supply on Japans side was practically ensuring their defeat very soon. The bombing was also extremely inhuman and cruel considering the results. The first bomb dropped in Hiroshima killed about 50,000 people and destroyed much of the city. The second bombs dropped in Nagasaki killed about 40,000 people. Not only that, but the long term affects Japan was left with cost many more lives. The radiation left behind because of the bombs affected the civilians resulting in more deaths and the bomb led to a nuclear arms race for countries to show who has the most power.
There are many reasons