The U.S. believed that if the atomic bomb could end the war, Soviet
influence after the war would be restricted and domestically the
tremendous cost of development would be justified.
The main thing that Hitler did in defiance of the Versailles Treaty that upset the world was to bring back the German military, which was explicitly against the rules of the military. His reasoning for this action was to preserve the national defense of Germany, although this soon led to the invasion of Poland, which led to war.
In general, no, Montesquieu did not think a good way to make laws is for all the people to directly vote on them, since he thought a more efficient way was to have a Republic, in which people elect representatives. <span />