Sure it had something to do with intimidating the Russians but an invasion of Japan would have been brutal and there would have been huge amounts of casualties on both sides, just look at Okinawa. Kamikaze pilots attacking the fleet, huge amounts of civilian and troop deaths. The controversy at the time was not this, it was the did FDR know about Pearl Harbor thing, people just wanted it to be over and understandably so.
The funny thing about this (there's nothing haha funny about it obviously) is that the firebombings of Dresden and Tokyo were absolutely brutal, especially Tokyo but for some reason conventional weapons get less attention.
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