No is wasn’t.
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"At Hiroshima the atomic bomb killed about 80,000 people …]. At Nagasaki the fatal casualties were 45,000 …]
Compare this with the results of two B-29 incendiary raids over Tokyo. One of these raids killed about 125,000 people, the other nearly 100,000."
“General MacArthur’s staff anticipated about 50,000 American casualties and several times that number of Japanese casualties in the November 1 operation to establish the initial beachheads on Kyushu. After that they expected a far more costly struggle before the Japanese homeland was subdued. There was every reason to think that the Japanese would defend their homeland with even greater fanaticism than when they fought to the death on Iwo Jima and Okinawa.” -
theatlantic.com/past/docs/issues/46dec/compton.htm*
The decision to use the Bomb saved countless Japanese lives.