3.) PG here, the assistance which it affords to the public, it cannot be judged to have set up a new legislative, but to have restored the old and true one, and to have rectified the disorders which succession of time had insensibly, as well as inevitably introduced…
Isn’t he really saying that the legislature is god-given, “old and true”, while the divine right of kings is merely a Johnny-come-lately disorder which only time introduced?

Enter John Adams, a barrister with a sense of humour. He showed up the conundrum in clear language:
The public good, the salus populi is the professed end of all government, the most despotic, as well as the most free.
What Adams & others did when they were writing the basics for the US state was essentially to rework not only the words but the context of Cicero’s original.

The maxim is no longer sage advice to a potential ruler but now a bold assertion that the public good is determined from the perspective of a public who is the ruler.