Zen, all your complaints about Superman trying to save people who can't be saved are addressed by the character of Lex Luthor.
People focus too much on the powers in superhero stories, it's the character interactions that I find interesting.
Of course Superman could
end Lex Luthor in a heartbeat. But he doesn't do it because 1) Lex is
a childhood friend from his hometown (and one of Superman's defining characteristics is that he's
a Kansas farmboy at heart, not an alien god), and 2) Lex's genius could usher in
a new golden age for humanity if he'd stop squandering it on petty crime, so Superman is always looking for opportunities to get him to turn to the good.
While the Joker is the dictionary definition of "cartoonishly evil," Lex Luthor is totally relatable. He's worked hard for his accomplishments, mental and physical, and he's been outdone at them all by the naturally gifted Superman his entire life. Then Superman turns around and starts preaching at Lex, telling him what to do, even though he's never had to
work for anything in his life. Who hasn't felt the urge to defy
a sanctimonious authority figure just for the sake of defiance in similar straits? Another great thing that All Star Superman captured:
My one complaint about All-Star Superman the comic is that it shows nothing of Luthor's reaction to Superman's apparent death.
I like the change in the cartoon that it's Luthor who
redeems himself (independently) by using his singular genius to figure out how to clone a new Superman, not Supes himself.
Another Superman story I love is Red Son, in part because the personalities of Superman and Lex Luthor are identical, but circumstances flip their position as hero and villain in the story.
And in this story Superman does succeed in making Luthor usher in a scientific golden age by letting Luthor think he'd destroyed him and giving up on trying to influence him entirely.
Plus Superman as a far-future human (a literal "man of tomorrow") is so much cooler than him being from a race of overpowered aliens.
Two working class dudes, one black one white, just baked a tray of ten cookies together.
An oligarch walks in and grabs nine cookies for himself.
Then he says to the white dude "Watch out for that black dude, he wants a piece of your cookie!"