By "human cruelty" you are no doubt referring to:

• The Japanese seizure of Manchuria

• The Japanese Rape of Nanjing or Nanjing Massacre

• The Japanese attack on Pearl Harbor

• The Parit Sulong Massacre

• The Laha Massacre

• The Alexandra Hospital Massacre

• The Manila Massacre

• The Sook Ching Massacre

• The Kalagon Massacre

• The Jesselton Revolt

• The Panjiayu Massacre

• The Wake Island Massacre

• The Tinta Massacre

• The Bataan Death March

• The Sandakan Death Marches

• The Dutch East Indies Massacres

(I could go on at length, but I hope you see my point)

-- and the attendant Japanese war crimes that resulted in the looting and destruction of heritage, torture, rape, enslavement, starvation, human experimentation, cannibalism, and ultimately the deaths (including chemical and biological attacks) of 10 - 14 million innocent victims, including Chinese, Indians, Koreans, Malays, Indonesians, Filipinos and Indochinese (mostly civilians) and European, American, and Australian military and prisoners of war.

https://en.wikipedia.org/wiki/Japanese_war_crimes

"we shall not repeat the evil" is a tacit Japanese admission of guilt, but your article seems to miss this entirely and instead to take every opportunity to frame the bombing as the cruelty of the West, including characterizing the bombing as "an act of terror", not of war or self defense, and Oppenheimer as essentially a war criminal.

"In Germany, Holocaust denial is a crime. In Japan, it is government policy."

Do some homework. Learn some history. Comment with the benefit of some actual (rather than sentimental) context. You may have simplified this complex story a bit too much.

The world picked survival over humility, not "humility over hubris", just as it did with the Nazis in Europe. So sorry you were sort of bummed out by what you saw without really understanding it.