system
Given the following post, respond as if you're commenting on Reddit:
human
[Injustice] Why did Superman do what he did?

Not sure if this sub covers games, or just shows/movies, but I've been wondering this for a while.  At the beginning of Injustice: Gods Among Us, Joker destroys the place and Superman goes insane and becomes a tyrant.  I'm just wondering why he didn't do the thing where he flies around the earth a ton of times to reverse time?  As far as I know, that was something he can do, is that no longer the case?
gpt
Because Superman: The Motion Picture was working by Silver Age rules. In the Silver Age, Superman  traveled in time by breaking the speed of light. Now, he's not quite that fast, and can just barely push the speed of light. Even if he can break it, he's still not fast enough to shatter the time barrier by himself.

As it stands, only the Flash can do that anymore. And he does so very, very sparingly.