> They were men after all, not gods - as they warned later generations to remember.
Indeed.
A digression:
If you read the Federalist Papers, or the debates of the Constitutional Convention, you can get a sense of what they were trying to do, which was to come up with some form of government that would work reliably. They had a few specific things they wanted to avoid.
First was a king. They'd fought a war to get rid of a king, and didn't want that again. (Well, Hamilton wanted to be king, but few others agreed.)
They wanted a stronger central government than the Articles of Confederation the country was then running under. That was like the United Nations - a group of sovereign states that could only act as a group if everyone cooperated. It wasn't working too well, which was the reason for a constitutional convention.
They wanted to avoid anarchy. The French Revolution was about to happen, and the run-up to it wasn't looking good.[1]
Those were the design constraints. Most of the arguments were over how strong the executive branch should be vs. the legislative branch, and how strong the federal government should be vs. the state governments.
As working models, they had the state governments, where a governor and two houses was the usual pattern.
They ended up with a reasonably practical design. It's come unglued because Congress, which is supposed to be in charge, can't get its act together.
[1] https://en.wikipedia.org/wiki/Timeline_of_the_French_Revolut...