Japan was an aggressor against the US in WWII.
The bombing of Hiroshima and Nagasaki saved countless US military lives.
No further explanation is required.
Amen
The military's best estimates at the time were that there would be 1 million American causalities incurred in an invasion of mainland Japan. I imagine that stat made Truman's decision a lot easier.
It also saved millions of Japanese civilian lives.
Had the Japanese homeland been invaded all would have been ordered to commit suicide rather than surrender
Many would have complied
Multiply Okinawa by a magnitude of 100, or more
The bombing of Hiroshima and Nagasaki saved countless US military lives.
No further explanation is required.
Once the public found out the existence of the nuclear devices, had Truman refused to employ them, he would be brought up on war crime charges...