No regrets, nor should he.
Japan had its own nuke program and even reportedly tested a nuke in North Korea several months before we tested ours.
They were the enemy and wars are won by killing as many of them as possible.
Wars are won by making the cost of continuing it so great that the enemy stops fighting and surrenders. Without those two nukes, Japan would have continued to fight for months if not years. But truthfully, Japan did attempt to negotiate a conditional surrender and were rebuffed.
Orly? Do tell...
“reportedly tested a nuke in North Korea several months before we tested ours “
Never heard this before? But it may have been considered in Truman’s decision although I have not read that it was.
According to Wikipedia:
“The Japanese program to develop nuclear weapons was conducted during World War II. Like the German nuclear weapons program, it suffered from an array of problems, and was ultimately unable to progress beyond the laboratory stage before the atomic bombings of Hiroshima and Nagasaki and the Japanese surrender in August 1945. “
“Early on in the war Commander Kitagawa, head of the Navy Research Institute’s Chemical Section, had requested Arakatsu to carry out work on the separation of Uranium-235. The work went slowly, but shortly before the end of the war he had designed an ultracentrifuge (to spin at 60,000 rpm) which he was hopeful would achieve the required results. Only the design of the machinery was completed before the Japanese surrender.[11][16] “
https://en.wikipedia.org/wiki/Japanese_nuclear_weapon_program
Just about every technically advanced country in the world had a "nuke program" in the 1940s. What that meant was that the country had nuclear physicists who realized that atomic fission could create a bomb. The Russian physicist Kurchatov and German physicist Heisenberg were two of them. The Japanese had a physicist as well. What they lacked was the gigantic engineering and industrial capacity to take uranium and either separate the isotopes or breed it into Plutonium in sufficient quantity to make a bomb. Only the United States had that capacity during a war that strained every other economy past its limit to make the weapons they needed to survive. We had the capacity to make atomic weapons because we could. The Japanese nuclear program was working on a lab experiments in Uranium Hexaflouride in the gaseous diffusion isotope separation process. They were never close to building a massive K25 gaseous diffusion facility like we had at Oak Ridge, which is what was needed to make a Uranium bomb.
The Germans under Heisenberg were dicking around with a prototype reactor, which Heisenberg called a "burner," to make Plutonium. But never he came close to making it operational. Kurchatov was only working on theories because the USSR simply didn't have anything to spare on nuclear testing during the war.
and even reportedly tested a nuke in North Korea several months before we tested ours.
The test to which you refer, if it happened, was a conventional explosion involving uranium with the idea that the explosion would spread radioactivity. It was a chemical weapon, and not at all a nuclear weapon. There was no nuclear fission involved.