The Japanese had thousands of suicide boats ready to blow up U.S. ships in Japanese coastal waters.
I always asked World War II veterans, including vets who fought against the Japanese, if they approved Truman’s decision to drop the atomic bomb on Japan. I got the same response 100% of the time, yes. One Marine Corps WWII combat veteran told me in 1980 “If not for the atom bomb we would still be fighting the Japanese today.”