The government of the United States was developed under the idea that nobody knew how to make a government, or how to govern.
The result is to invent a system to govern when you don't know how. And the way to arrange it is to permit a system, like we have, wherein new ideas can be developed and tried out and thrown away.
The writers of the Constitution knew of the value of doubt. In the age that they lived, for instance, science had already developed far enough to show the possibilities and potentialities that are the result of having uncertainty, the value of having the openness of possibility.
The fact that you are not sure means that it is possible that there is another way some day. That openness of possibility is an opportunity. Doubt and discussion are essential to progress.
The United States government, in that respect, is new, it's modern, and it is scientific.
It is all messed up, too. Senators sell their votes for a dam in their state and discussions get all excited and lobbying replaces the minority's chance to represent itself, and so forth.
The government of the United States is not very good, but it, with the possible exception the government of England, is the greatest government on the earth today, is the most satisfactory, the most modern, but not very good.
--Richard P. Feynman in The Meaning of it All [A single paragraph in the master's book.]