Dropping the Atomic bombs absolutely saved lives. Here is why:
“The battle was the bloodiest in the Pacific, with around 50,000 Allied and 84,166–117,000 Japanese casualties, including Okinawans conscripted into the Japanese Army. According to local authorities, at least 149,425 Okinawan people were killed, died by coerced suicide or went missing.”
Battle of Okinawa - Wikipedia
Not only that, it prevented Japan from being divided, like Korea, which most likely would have resulted in a Civil War with the Communists.