Nonsense. The Founders intended the United States of America to be a whole new thing leaving the authoritarian governments of Europe behind and embarking on a grand experiment in which the people assigned the government its power and authority instead of the other way around. They certainly did not expect our courts to utilize case law from the corrupt and oppressive court systems left behind. By existing law, I mean what the letter and intent of the law was expected to be at the time it was enacted into law. Not what some future court decided to rewrite or interpret other than as intended.
And I draw my perspective and understanding of these issues from studying the Founding documents and the thought processes of the Founders as well as the great thinkers who helped them form their own perspectives for most of my adult life. So I have a pretty good idea of what they intended the three branches of government to be.
Nonsense? Then perhaps we come from a different America?
Wanna blame someone or something for our systemic problems in our Judicial Branch? When's the last time you've read the Preamble to our Constitution? In my opinion, We the People, have done a piss poor job of carrying out that noble mission. We have enabled a self-will-run-riot government to grow stronger and stronger for decade after decade...and NOW we're upset? We only have ourselves to blame.
Despite the above....
Our nation has virtually no resemblance to what it did prior and up to the creation of our Constitution. And since the Constitution's creation, it changed, Amendments were added. Yes, the core principles are a necessity and still exist, but didn't become suspended in some time continuum the moment the Constitution was ratified by all States. We had to start somewhere. The letter and intent by the Framers, as you've described it, came from strong discord, torn feelings, beliefs, antagonism and opposition regarding the principles to be set forth to grow our nation . During those days everything was in constant flux, including the letter and intent of Constitution. The letter and intent remains to be a source of conflict today. Can you image someone claiming that there's only one interpretation of the bible...especially if it is contradictory to yours? Our Constitution was NOT a perfect and complete instrument. No Constitution will prevent human conflict and nor tell us how to totally resolve all conflicts.
The fundamental design of our Constitution is derived from a host of core principles that were established in Europe, which came from so many sources over the ages that became essential for humanity to evolve into what we call civilized societies. The founders didn't invent the wheel. The Framers studied the Senates of the Roman Empire, The Magna Carta, The English Bill of Rights in 1689, etc, etc, etc.
The reality is that the blueprint for our judicial system wasn't fully developed in the Constitution by the Framers. There's no such thing as a one-size-fits all laws. So many of the laws that existed at the time of the Framers aren't relevant or became outdated. Updating is a necessity, change is constantly required. How much need was there for Internet law at the time? Intellectual Property law was almost in its prenatal stage. Even Corporate law that emerged in the days of the Framers would be so antiquated and unrecognizable today...and basically worthless.
The framers knew that the growth of society and demands on government would have to be forever changing...or cease to exist.
Our nation's judicial system would have come undone long ago had our Court systems and laws remained static. They would implode without the ability to grow and change with society.
In other words, while the core elements of the Founding Blueprint for our government's role and the rights of the citizens has, for the most part, remained enduring, but when applied to the law, the outcomes are near inexhaustible, based on nothing more than human conflict that didn't exist at the time of the Framers. These folks didn't have cognitive rigidity. They knew that being enduring wasn't enough. The Constitution had to be a source of creation in and of itself. This is called "case law", legal precedents that are essential to our system of law and justice.