Answer :
Assuming that you mean nuclear bomb,the author is saying that dropping a nuclear bomb attacks the lowest moral compass, i.e its the lowest of lows. The author is saying that this is the least human thing to do, and that it destroys even the weakest of morals.
Every human being has the right to live peacefully. As morality teaches humanity, principles of ethics, and compassion for others, all of this gets buried when a nuclear bomb is dropped.
What is meant by "morality"?
Morality is a set of standards that enable people to live with each other in harmony. It is society who decides appropriate behaviour. It can take principles from religion or by rational people. Moral behaviour brings life to this world.
Hence, it can be stated that the author means to say that by dropping a nuclear bomb, it is the death of humanity.
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