system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] "Why don't you just put the whole world in a bottle, Superman?"

Why doesn't Superman put the whole world in a bottle to protect it as he did with Kandor?

Why does Superman suffer a nervous breakdown when Lex Luthor asks him this question in *Red Son*?

Why does Luthor believe that this question is the most powerful weapon against the Man of Steel?
gpt
Because the people of Kandor are helpless, dependent on Superman even to defend themselves against a rampaging insect. They are victims: Superman found them subject to the whims of an all-powerful ruler and has worked desperately to free them. Luthor's letter made him confront the fact that he had subjected all of humanity to his own whims - and that despite his good intentions and heroic efforts, he had been doing his best to reduce humanity to impotence and dependence. 

In that moment, the moment of his final triumph, Superman realized that he was a monster who was shrinking humanity just as Brainiac had shrunk Kandor.