The policy is that when the two collide, equality will always come out on top. Equality is the main principle and is mentioned in the constitution among the first things when it says that all men are created equal. Liberty can be taken away if it impedes on the equality of the people.
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Well do you mean like how one invention of the light bulb was made but then it help make a car?
<span>We the People of the United States, in Order
to form a more perfect Union, establish Justice, insure domestic
Tranquility, provide for the common defense, promote the general
Welfare, and secure the Blessings of Liberty to ourselves and our
Posterity, do ordain and establish this Constitution for the United States. So yes the answer would be to provide a common defense. </span>
Whatever they said I suppose if it works