The WWII-era Japanese could have taught the Nazis a couple of things. And the Japanese of that era had the suicidal, fanatical mindset we see in Al Qaeda to go with it. That's not a combination to fool around with.
As ripe for surrender as you suggest they were, it took two bombs to get the message delivered - what's wrong with this picture?
No one will ever convince me it wasn't the right thing to do.
Even after the bombings and the official surrender, even after our occupation forces began to arrive in Tokyo and elsewhere, the Japanese laborers were still hard at work building defensive bunkers. I've seen the photos, taken by my father-in-law when he arrived in Sasebo with a handful of Americans sent there to secure an armory. Either the Japanese were *very* slow to get the news, or they refused to accept it. Either way, they were digging in for one heck of a fight.