We lost 3000 people on 9-11 and our nation was horrified.
On August 6, 1945 a United States B-29 bomber released a nuclear weapon over Hiroshima Japan.
The bomb, nicknamed Little Boy, exploded 1900 feet above the city instantly killing 140,000 of the 350,000 inhabitants, completely destroying 2/3 of the city.
This was an attack on a civilian population, not a military encounter.
We don't teach this in our history classes; but we should never forget.