The bombs dropped upon Hiroshima and Nagasaki were not atomic.
However, a few things set the two cities apart from others. Foremost among them is "radiation sickness", - both acute and delayed, that is, cancer and leukemia. If there were no atomic bombs, how can radiation sickness be accounted for?
Aside from the "workaday" destruction that does not match a proper nuclear detonation, decisive proof against atomic bombs comes from the radioactive fallout. While such fallout is indeed found at both cities, it, too, does not match a real bomb.
At Hiroshima, we merely find a tiny bit of what looks like a mixture of reactor waste and reactor fuel. At Nagasaki, we find plutonium in considerable amounts. It can be shown, however, that this plutonium was not dispersed in 1945, but only some two years later.
MUSTARD GAS, NOT RADIATION
If we conclude that no atomic bombs exploded, then how could we explain the radiation sickness?
The answer is quite simple: with mustard gas. This is a battle gas that attacks the lungs, the skin, and the interior organs. Among the latter, the bone marrow is very severely affected, and in a manner very similar to radiation.
Then, what for? Shortly after the bombings, a wave of nuclear fear propaganda was unleashed upon the world. Nuclear war and annihilation were right around the corner - and the answer was world government. Ironically, it was Comrade Stalin who preserved, for the time being, the national sovereignty not only of the Soviet Union but also that of other countries - at least in a formal sense. How much, or rather how little, real sovereignty is left is painfully obvious in the staged COVID-1984 crisis.