It could work if the majority of the world decided to legally give Superman supreme power. Like, country after country changing the constitution to give control to mak laws and enforce it to Superman.
So he runs the world, some minority may oppose him, but 90% of humanity is happy with him in charge. He is actually making things better, why would anyone be against it if not by principle? But, if everyone else wants to follow him, what gives the opposing 10% the right to fight against it?