The Preamble, or as it would be better described, the Statement of Purpose, which lists the document's reason for being, the crowning purpose of which is "to secure the Blessings of Liberty to ourselves AND OUR POSTERITY."
You could check out the Fifth Amendment as well, which at the heart of the Bill of Rights protects all persons from being killed without a fair trail and conviction on a capital offense. The Fourteenth Amendment reiterates this guarantee of the protection of the most fundamental of unalienable, God-given natural rights.
In order to even attempt to refute this, you have to reject the most fundamental premises of our form of government, in their entirety.
No, I’m just saying that this Government was not setup to force MORAL VALUES DOWN OUR THROAT.. It was setup to fight wars, protect our borders, establish treaties in a unified way.