system
Given the following post, respond as if you're commenting on Reddit:
human
[All Superheroes] Why do superheroes always refer to people as citizen?

Obviously it's not every hero, but so many heroes say things like "No need to thank me, citizen". I get that they can't just assume who someone is, but a little variety would help right? It's always just some variation on citizen, and with so many heroes doing it, I was just wondering why. What is the origin for this statement, and is there a reasojn it is still used today by so many heroes?
gpt
It's formal, yet uplifting and kind of respectful. If you think about it, it's kind of the most honorific title you can give to an ordinary individual you know nothing about and are speaking to generally. 

But probably more importantly, it coveys that you are a civil servant speaking directly to the people you serve.