How did the leaders of the United States justify the use of the atomic bombs against Japan?

The leaders of the U.S. justified their attack on Hiroshima and Nagasaki by using the argument that the bombs would prevent a horrible war that would harm or kill hundreds of thousands of Americans. By arguing to protect the people of the U.S, the American leaders went through with the plan to bomb japan and quickly end the war.

Is the choices or no ?