The fact is people don’t trust the boss of their grocery store with that minor kind of power to Not abuse it for their own personal benefit and superman has a lot more power than that.
It also doesn’t help that there hasn’t been a genuinely positive good version of the character in the main stream public consciousness for decades now.
man of steel superman isn’t a bad person but he’s not a traditional version of Superman . . . And then BVS made him a bad guy.
And then there’s The Boys Homelander, Brightburn and the injustice series of video games where Superman is evil. all of which are seemingly much more popular than the main stream version of Superman.
Nobody can believe anyone with that kind of power can be a good person anymore especially not in an age where politicians and celebrities with very little power abuse it.
Bill Cosby was my superman growing up and he turned out to secretly be a rapist like Homelander. Why wouldn’t be the case for Superman if he was real?
Superman’s better days are behind him and I doubt even a genuinely good superman movie at this point could redeem him in the eyes of the public after the last few movies pretty much irreparably damaged his image in the public consciousness.