Do you think the citizens of Hiroshima thought you were heros?
To the Japanese people, you were terrorists.
To be blunt, the Japanese would have fought until there was only one Japanese left. That is not our cultural mindset. We wanted to minimize casualties and continuation of fighting in the Pacific arena meant devastating losses for BOTH sides. We'd had it. We were not willing to sacrifice that many more American lives. (Considering that WWII ending when it did is all that stopped my father from being shipped out, I'm grateful for the decision.)
War is an ugly thing. The Japanese attacked us and had to be ready for whatever followed. Obviously, they thought we couldn't carry on a fight on both oceans and would be spread too thin, but we did. The Japanese government was warned that unless it surrendered, it would soon face "complete and utter destruction." After the Hiroshima bomb, they clearly knew the destructive capability of the bomb, yet chose to continue fighting. Therefore, they CHOSE to sacrifice their own people.....Which just backs up what some of have said about their willingness to die for their emperor/country. If anyone was a terrorist, it was the Japanese government for willingly sacrificing their people even though they knew what was coming.
It is a terrible thing that so many Japanese people had to die. But the cold hard truth is that many, many times over would have died had the fighting continued. The lowest estimates, which are the early ones and are now considered unrealistically low, were in the few hundred thousands per side. The more realistic ones, based on previous loss ratios and more accurate data on how many Japanese troops were indeed on the islands, placed combined Allied (mostly American) and Japanese military losses perhaps as high as 5 million, but probably more along the lines of 3 million. And that does not include civilian losses.
If we hadn't dropped those bombs, many of us wouldn't be here because our fathers and grandfathers would have died in the next year or two of battle. No thanks. Dropping those bombs actually saved lives, numerically speaking. A good many of the lives saved were Japanese who would have died in battle or more traditional bombing. Dropping the bomb ended the war sooner. Dropping the bomb made certain we won, and not the Japanese.
So by dropping those bombs, we saved millions of lives, ended the war quickly and made certain we prevailed over the Japanese. We even gave them a chance to avoid the bombs by surrendering and made it clear they were not ordinary weapons.....and there is no doubt they knew of the destructive capability after the first one was dropped. So they had every chance to avoid it and chose not to.
I admire President Truman for making the difficult decision he did. As horrific as using the atom bomb was, the alternative was, IMHO, even worse. It would have just been a slower, more drawn out loss of millions more lives on both sides. Of course, he was primarily looking out for America's best interest, as he should have since he was our president. But his decision wound up saving Japanese lives as well. Truman looked at the scenarios, and chose the lesser of evils. And sometimes, "evils" are all you have to pick from. You don't have any "good" choices," just some that are less bad than others.