The one thing that I don't like about the A bomb droppings in 1945, is how it basically signalled the start of the arms race. Apart from that, I don't think much on it. What were the alternatives? Negotiation? Not a chance, the Japanese were too proud. Invasion of Japan.? That would have costs millions of lives (both soldiers and civilians). Even a (hypothetical) naval blockade could have taken years to have effect. All potential alternatives, would have just prolonged the war even further.
Before the bombs dropped in 1945, Japan knew the war was no longer going in its favour. But, that just really increased their will to fight. Kamakazi missions aren't just the only example. The Japanese also put in place in many areas, a plan to exterminate it's POW's. If the US didn't drop the bombs when it did, not only would more soldiers on both sides have died, but also civilians who would be caught in the middle.
As for Japan's sense of "honour" at that time, I can think of some perfect examples where they put it into practice. Nanking and the Korean comfort girls aside. 1942, fall of Singapore and Malaya. Allied troops, including British and Australian soldiers captured and put into POW camps. Fair enough, that's war. But then for the next few years, forced into virtual slavery, being tortured, and executed in numerous ways. Starvation, and tropical illness. Over a third would die in these camps. As well as forced on death marches to kill them off in Borneo. In one incident, 24 Aussie nurses were forced to walk into waist deep water, then machine-gunned down. Only one, by God's grace, survived.
Allied servicemen shot down and captured, were beheaded straight away by their captors. There's one particular famous photograpgh of a blind folded allied servicemen kneeling as a Japanese officer raises his sword. Troops who would be captured in battle, were tied to trees and used for bayonet practice. As well as (in New Guinea anyway), turning to cannabalism.
Japan also gained the title of the first foreign nation to ever attack Australian soil (primarily bombing our city of Darwin, filled with civilians) also killing thousands. That was without provocation.
I'm unsure about what other viable alternatives there were to the bombs. But it's obvious to me, what Japan's sense of honour was all about. As well as their willingness to continue the fight.
A few of my examples were just based on the general Aussie experience of that war. Which was brutal for us enough. However, considering that America didn't just fight in the South Pacific, but all the way to the Philipines, I have no doubt that they would have had these experiences ten fold to us. Plus, any Allied invasion would have been made primarily of U.S troops. Given that fact, I don't know why any American could object to the bombings, unless given a more viable alternative.
Innocents died. But by killing hundreds of thousands of civilians, the US saved millions more.