- Report produced by the U.S Strategic Bombing Group (employed by Truman) to survey the air attacks on Japan concluded that: 

“Based on a detailed investigation of all the facts and supported by the testimony of the surviving Japanese leaders involved, it is the Survey’s opinion that certainly prior to 31 December 1945 and in all probability prior to 1 November 1945, Japan would have surrendered even if the atomic bombs had not been dropped, even if Russia had not entered the war, and even if no invasion had been planned or contemplated.” - page 52-56 

- Dwight Eisenhower future president and then Supreme Commander of the Allied Forces also said:

“I had been conscious of a feeling of depression and so I voiced to [the then Secretary of War] my grave misgivings, first on the basis of my belief that Japan was already defeated and that dropping the bomb was completely unnecessary, and secondly because I thought that our country should avoid shocking world opinion by the use of a weapon whose employment was, I thought, no longer mandatory as a measure to save American lives.” - page 380

- Admiral William Leahy, one of the highest ranking officials in the US army during WW2 wrote of the usage of the bombs:

“It is my opinion that the use of this barbarous weapon at Hiroshima and Nagasaki was of no material assistance in our war against Japan. […] My own feeling was that in being the first to use it, we had adopted an ethical standard common to the barbarians of the Dark Ages. I was not taught to make war in that fashion, and wars cannot be won by destroying women and children.” - page 441

- General Douglas McArthur, another high ranking US official in the war:

“[When asked about his opinion on bombing Japan] He replied that he saw no military justification for the dropping of the bomb. The war might have ended weeks earlier, he said, if the United States had agreed, as it later did anyway, to the retention of the institution of the emperor.” - page 70-71

- On September 9, 1945 Admiral William F. Halsey commander of the Third Fleet publicly quoted as saying:

“The first atomic bomb was an unnecessary experiment… . It was a mistake to ever drop it… . [the scientists] had this toy and they wanted to try it out, so they dropped it… . It killed a lot of Japs.” - online source

- The US secretary of war, Henry Stimson, speaking to President Truman:

“I was a little fearful that before we could get ready the Air Force might have Japan so thoroughly bombed out that the new weapon [the atomic bomb] would not have a fair background to show its strength.” - diary of Henry Stimson which can be found online here 

- Even those deploying the bombs questioned the decision to drop them on civilian cities:

“I thought that if we were going to drop the atomic bomb, drop it on the outskirts–say in Tokyo Bay–so that the effects would not be as devastating to the city and the people. I made this suggestion over the phone between the Hiroshima and Nagasaki bombings and I was told to go ahead with our targets.” - online source

- Lewis Strauss Assistant to the Navy Secretary James Forrestal on the locations of the bombings:

“I remember suggesting […] a large forest of cryptomeria trees not far from Tokyo. The cryptomeria tree is the Japanese version of our redwood… I anticipated that a bomb detonated at a suitable height above such a forest… would lay the trees out in windrows from the center of the explosion in all directions as though they were matchsticks, and, of course, set them afire in the center. […] Secretary Forrestal agreed wholeheartedly with the recommendation.” - page 145

So to recap: 

A lot of American generals were against using the bomb as they felt it served an empty purpose.

Those who agreed with its usage completely disagreed with dropping them on cities.

Truman went ahead and had them detonated in two highly populated civilian cities anyway. Two cities that had remained mostly untouched by regular bombings throughout the war precisely bc of their lack of value to the Japanese war effort.  

This is the Great Pyramid of King Khufu.  Everybody knows the Great Pyramid of King Khufu, but you probably don’t know about the Shit Pyramids of his father, King Sneferu.  This is a shame, because they are amazing.

When King Sneferu came to the throne of Egypt, the cool thing that all the pharaohs had was a Step Pyramid, like the original one built by King Djoser and designed by Imhotep (not the mummy).  King Sneferu could easily have had one one because his predecessor King Huni had died before his could be finished. All Sneferu had to do was step in and put the last few blocks on.

But King Sneferu had a vision.  He didn’t want any old Step Pyramid.  He was going to build Egypt’s first smooth-sided pyramid, and make King Huni’s pyramid way taller in the bargain.  It didn’t work.  The core of Huni’s pyramid couldn’t handle the modifications and nowadays the Step Pyramid at Meidum looks like this:

It’s not on a hill - that’s the outer layers of the pyramid that have fallen down all around it.  The name of the structure in Arabic is Heram el-Kaddaab, which means something like The Sort-Of Pyramid.

Anyway, King Sneferu was understandably disappointed and made his pyramid-builders start over from scratch at a different site.  Apparently having learned nothing about the Big Fat Nowhere that hubristic pyramid ambition was going to get him, this pyramid was designed to be even taller and pointier than the last effort!  Too tall and pointy, in fact - the bedrock proved to be less stable than he might have hoped, and by the time the pyramid was half-finished stuff was already moving and cracking inside of it.  There are ceilings in this pyramid that are to this day partially held up by wooden beams.

The builders seem to have panicked and decided that the only way to finish the pyramid without another disaster was to make the top half lighter than the bottom half.  They did this by changing the angle of the slope, ending up with a pyramid that looks like this:

Egyptologists call this one the Bent Pyramid for fairly obvious reasons.  Uniquely among Egyptian Pyramids, it has most of its smooth outer blocks intact, rather than having them all stolen to build other stuff (most of medieval Cairo is built from the skin of the Giza pyramids).  I’m guessing this is because nobody dared touch the thing for fear the whole structure would come down like a giant limestone game of Jenga.

I’m sure the pyramid-builders were very proud of this solution.  Sneferu appears to have been less so.  He had them move over about half a mile and start over.  Again.  Why only half a mile when he had them move 34 miles between the Sort-of Pyramid and the Bent Pyramid is a mystery.  I think he wanted to keep them in sight of the Bent Pyramid so they could look at it and feel ashamed every once in a while.

And there they built Sneferu’s third pyramid, which is called the Red Pyramid.  As pyramids go, it’s a very cautious one - it’s got the shallowest slope rise of any Egyptian pyramid, and while it’s the same height as the Bent Pyramid it spreads its weight over a much greater base area, making it far more stable.  Sneferu seems to have been happy with this one, because he was buried in it.  Either that, or after a forty-eight-year reign he just finally died and that was the pyramid they used because it was the nicest of the three.

These three pyramids together actually contain substantially more stone than the Great Pyramid of Sneferu’s son Khufu.  By the time Sneferu died, his workforce had honed themselves into a lean, mean pyramid-building machine.  They had already made every possible pyramid mistake.  So when Khufu announced that he didn’t just want a great pyramid, but The Great Pyramid, these guys built him a pyramid so fucking great that we now think aliens must have done it.