I doubt that The Founding Fathers ever envisioned a situation where we would have worthless career politicians who can regulate their own pay, and are able to enrich themselves through nefarious means to the point that they have four mansions (a-la joe biden). Being a career DC politician is much, much more lucrative than anything else the lazy, weak-minded could imagine. The original Patriots served for expenses only and did so as legitimate service.
Nor did the Founding Fathers ever envision that the American people would tolerate such malfeasance and greed from their elected representatives. Such a complete lack of accountability in this republic (largely a function of our own forbearance) was beyond their comprehension.
We voters enable the corruption and its insidious effects on us all. We don’t seem to mind living with the consequences of our apathy.