One possible explanation of the roots of Superman’s rage is a rumor that he was actually born on the planet Krypton.
Some clear facts here. Superman never was given citizenship, nor did he ask for citizenship. He has no green card. He has entered and exited the US without the aid of TSA agents, which is strictly illegal. Superman has never shown an ID or a passport. With the exception of Superman and Martian Manhunter...these two gentlemen are the only non-Earthlings with any citizenship. Wonder Woman is an Amazon, but definitely born on Earth. Finally, as Clark Kent....he has paid taxes each and every year and will be able to collect social security and medicare at age 65. Note, never once has Superman or Clark Kent indicated that they have voted, so you can’t be sure if they voted Democrat or Republican.
Oh, and if you wondered....Bruce Wayne is a multi-millionaire and very likely to be a Republican.