system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel Comics] If people want the Super Soldier Serum so badly, why don't they time travel back to when it was used or made to get it?

A decent amount of people can either time travel or have access to a working time machine.
gpt
Time travel usually doesn't work that way in Marvel (except when it does). In essence, you have the possibility of causing more and more problems to the timeline the more you attempt to do. What if you go back and attempt to steal the SSS, and when you return to your present your world is completely different?