What I would have done? I would have left Palpatine exactly as he was. I am not arguing against the representation of his character. He was an archetype, Lucas celebrating the ultimate source of evil, the devil et cetera et cetera. But once you've seen that villain once, you have seen them all.
Precisely. Star Wars is full of archetypes, and this has been stated endlessly since the movies were first created. It's famous for putting ancient archetypes into the perspective of the general public. So, why are you complaining about the villains?
"Without contraries, their can be no progress".To laud his character up as a moral warning (of what exactly? the dangers dark swimwear?) is almost an injustice to Palpatine in the first place. But if Star Wars was a psychological document, you'd see certainly have to see where Palpatine came from, to understand what he became.
One of the themes of the entire saga is what the dark side can do to a person. How it can take principled aristocrats like Dooku and turn them into world-conquering lunatics, how it can take a well meaning young boy who lived to help people and turn him into a murdering, agonizing shell of a man, and - worst of all - how it can turn people into someone like Palpatine.