Injustice, I feel, kind of touches on an elephant in the room that comics try very hard to ignore.
Specifically, the reason for superheroes is because the authorities come in three flavors, worthless, more worthless, and actively malicious. A government that did its job would negate any reason for Batman to go out in a fancy suit and fight individual muggers. The super prisons leak like a sieve, the justice system is incapable of even managing to capture, much less prosecuting, the Joker or various other weirdos, many of whose entire superpower consists of wearing a costume.
Logically speaking this leads to only one outcome, the authorities get removed and replaced by a new government actually capable of protecting their citizens, the people should not and in a reasonable world, would not stand for being led by the equivalent of infomerical humanity. However the story the comics are based around isn't normally Superman taking over the world and ruling as God-Emperor so they jump through all manner of hoops to keep the government in charge, while also having to jump through an equal number of hoops to make sure the government can't do anything without Superman holding their hand.