system
Given the following post, respond as if you're commenting on Reddit:
human
[Man of Steel] Why is Krypton seen a failed society?

In MoS, there is a brief scene where Superman's mom makes a plea to her infant son to create a better society than Krypton. OK, sure, Krypton had basically a eugenics program which is horrible, and overall their society seems to have peaked a long time ago, but wouldn't by any standards Krypton be considered a smashing success? They existed for I think I heard hundreds of thousands of years, they developed technology that is miraculous, they mastered interstellar space travel before humans even existed, and for the most part, they seemed to have a successful and prosperous society.
gpt
The key word being that they *had* all of those things. Then they went backward, and became fearful and ignorant to the point where they ignored the warning signs of the destruction of their world, even from one of their highest, most esteemed scientists. Their colonies all failed for one reason or another, and they withdrew back to their homeworld and became isolationist.