Answer:
He means that the moral values of human race is lowered with the dropping of nuclear bombs.
Step-by-step explanation:
In the given excerpt, the author is addressing the dropping of the atomic bombs on Hiroshima and Nagasaki by the U.S. The writer considers that the dropping of the atomic bomb was not on Hiroshima and Nagasaki but the moral values of the human race.
The writer writes that these droppings are not a crime against humankind but God. By dropping the atomic bomb, the humans have stooped so low that it has shaken the very basis of a moral existence. The foundations of morality are overthrown with the use of such a destructive instrument as an atom bomb.