As you know, I’ve spent a lot of time reading about the Constitutional Convention recently. (What? You’re not listening to the Whistlestop podcast?) Reading the framing debates, it’s so clear the framers didn’t need evidence of abuse of power to worry for the state of the republic. If a norm or separation of power was not maintained that was alarming enough on its own. Men were sinful, power rapacious and liberty fragile. Leave open a door (or two) & a president will take advantage just as surely as a wolf will munch a bunny if you throw open the gate to its pen. One doesn’t have to wait for it to happen. It will. To stand by the gate & wait for the bunny shredding to be sure that power was being abused would have puzzled them.
This is also why only Frodo could carry the ring, but that’s another story.