Hey this is off topic from where the thread has gone, but on topic from where we started. We ended up doing a webcomic about his citizenship. It's here
There was a nice Robot Chicken bit
in which Arnold Schwarzenegger enlisted the help of Superman to remove illegal aliens. Towards the end, the dialog went along the lines of..
Anyway, on the subject of Comics and Real Life and the differences therein or the realism of such or whatever, now that I have a proper keyboard...
See : Ex Machina, The Authority.
Ex Machina follows the political adventures of Earth's first superhero (I'm presuming, since I don't recall any references to other supes in the book pre-incident) after he's given it up for being silly and runs for (and wins) Mayor of New York City. He spends a lot of time beating himself up because he only stopped the second plane from hitting the WTC.
The Authority is basically Warren Ellis (and later other writers) going on the premise of the Justice League saying "Fuck it, we're taking over" and ... taking over. It's difficult to start a war when Superman flies down and smashes all of your tanks in less time than it takes you to finish the order to go to war.
Ex Machina is easy to relate to because in the book there aren't many superpowered elements. There's our protagonist, an antagonist of sorts and one or two others are the only ones with superpowers. Everyone else is a normal.
The Authority... not so much. It works better when you're familiar with Superhero culture, I think, but on it's own it quickly becomes similar to what I find wrong with the Space comic books - difficult to relate with because the problems and concerns of various fictional space people are... clearly fictional space people. Yeah, you get a couple of token humans in there, but it's still difficult to call someone with a ring that can do whatever they want or space armor that turns them into a god of sorts a "token human". They're almost unrelateable right there.
Now, as for why Superman in the DC Universe doesn't just fix everything forever - throwing out Elseworlds where he does just that and it's terrible (due to the "If People just lived like they do in my fictional world, life would be perfect!" problem) and setting aside the "Gotta keep the Superman's Earth similar enough to Real Earth so people can relate" problem.. though it works with the fact that......
They've written Superman as someone who, while more than happy to do his Job... doesn't want to have to do his job. He's longing for the day that he shows up somewhere and someone not only says "Don't worry, Supes.. we've got this one".. but they mean it. Because they've got it, and Superman's redundant. Swooping in and solving all problems forever - disregarding how difficult it is to solve a crapload of problems - doesn't make Superman redundant, it makes him irreplaceable. And all Superman really wants is to be replaced. He didn't ask to come here, he doesn't think he's better than anyone else, but he knows he has abilities that allow him to do things others can't do, so he does them to help out... but he wants to be the neighbor that you know you can count on to move a couch but you help him move a bed in kind.
Now, we can still look at the various fictional Middle Eastern/Eastern Europeanish countries that DC loves to make up, or Latveria and Wakanda in Marvel to see where they don't mind dicking around with political things, but.. they're fictional. There's also the whole Identity Crisis thing DC did, or Civil War in Marvel where they talk about real-world issues by dressing them up in Spandex (Government Monitoring, Terrorism, etc). But they're hesitant do that in the real world mostly.... because they don't want to piss people off. And it's... very difficult to say what would be different where. I mean, there's a whole genre of fiction devoted to exploring how the world would be if certain historical aspects were slightly different.
So yeah, you could say that American Superhero Comic Writers don't have the stones to make realistic changes to their world (Batman removes Saddam in '91 - Giant Man stops the planes from hitting the World Trade Center, Superman kills Hitler) but... it's more like Comic Writers don't want to deal with the massive massive headaches that are going to come along with differing Comic reality too far from the real world - especially if said comic belongs to a Universe spanning a hundred titles written by a hundred different people.