The constitution is the contract between citizens and government. It enumerates the legitimate powers of the government, and limites those powers to only those enumerated.
"The idea that there are inalienable rights is an explicit moral statement".
Is it? Based on what moral principle?
The principle that all men have rights.
That was meant at the time of the writing of the Constitution to mean “All land owning men of good standing”. That alone was rather radical, and was preached against in Europe.
Saying you have “rights” is a moral statement. It says that even though one party has the power, they are not allowed to use that power against someone else. It is a moral statement just like “do not murder” is.
Read philosophy and history sir. The Constitution and the Bill of Rights was very radical for it’s time, and was attacked for intruding to far into the moral sphere of the landed gentry.