The purpose of a system is what it does.
Discussion
The purpose of the American system was to prevent government, groups of people, and individuals from infringing on the individual free agency of others.
That all change back around 1913-ish, when America was fundamentally changed by introducing forced taxation (16th Amendment) and the Fed.
The purpose of a system is what it does.
The rest of that quote is......
There is no point in arguing as to what it is supposed to do.