Oh really? If they understood so well that powerful people are inclined to mischief, why is it that there was absolutely NO ENFORCEMENT MECHANISM by which officers of the government would be punished for usurpation of power?
Nonsense.
The enforcement provision was built in. It's called impeachment for judges and officers of the executive branch.
It's called elections for congressmen and senators. They can also be expelled by a majority of their own house.
That impeachment has become almost entirely a dead letter is not the fault of the Founders. It's the fault of cowardly congressmen, more interested in re-election than the good of their country.
I sometimes think we'd have a better country if about every fourth president had been impeached and removed from office.
John Adams:
Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other.
The reason it’s for only a moral and religious people is that the moral and religious are less likely (not guaranteed, but less likely) to fall into the trappings of power.
There are all sorts of enforcement mechanisms built into our government. Elections and Impeachments for example. The crime is that they are not used to remove from power those that should be removed - those that threaten liberty.