The reason for the inclusion of the Preliminary Statement is this:
The Preliminary Statement was included to warn of the dangers of the use of atomic bombs and other similar resources. While the statement acknowledged that these resources were designed for the protection and defense of the nation, it also helped readers to note that if used wrongly, these things could have very harmful consequences.
So, the goal was to canvass for a responsible use of the armoury that was being set up by the scientists. Since other developing countries were now manufacturing these things, it was only necessary that the United States also have their storehouse of atomic bombs for improved defence of their nation.
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