Trump renames things to "America' as a 'fuck you' to other countries and because to him (and his followers) America means "USA". He's happy to make hateful yet empty gestures that to his base seem to show support for the country while he's robbing it blind and demolishing it. Renaming South Park to South America mocks Trump's renaming of things, but also names South Park after another continent. A continent full of people Trump has repeatedly insulted and bombed. A continent he invaded to take their natural resources.
I thought this was how I felt about South Park as well, but after switching off for several years I went back and watched the recent seasons and honestly, they still got it.
Interesting, I'd kinda lost interesting in the last few seasons were Rick was just a straight asshole with no real growth (or even teasing of growth). Just watching characters treat each other poorly isn't a particularly fun pass time.
That said, I'll try a few new episodes and see if it clicks.
Nero was just a poor boy who wanted to play the fiddle. Are you sure Caligula isn't a better comparison? He's the one who constantly tried to own the ̶l̶i̶b̶s̶ senate. That's what the whole deal with the horse was about.
Remember, South Park is a comedy.
It's consistent. This administration is a colossal failure.
Lets start with :-
That said, I'll try a few new episodes and see if it clicks.