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human
[Injustice/DC] Role Reversal, Batman Goes Bad, Superman Stays Good. Does Batman Even have a Chance?

I love the Injustice Comic book and video games, I really do. But they all fall into the same problem a lot of modern day Superman and Superman expy stories go into. They make Supes the villain. Because apparently nobody in DC is creative enough to figure out what to do with the boy scout aside from make him a villain, and/or make him a strawman/obstacle for the much 'cooler' Batman to beat up and/or overcome. 

But whenever I bring this up, there's always SOMEONE who says. 'Well. . . yeah. Batman goes bad? Worse case scenario Gotham becomes a little worse than it already is. Superman goes bad? EVERYONE is in big trouble. Gotham, Metropolis, Shanghai, etc. There's no way a man in a Batsuit with infinite money could be as much of a threat to the world as a literal Alien Demigod gone man.

While I don't think that assessment is entirely invalid. It also makes for an interesting thought experiment.

Let's say after seeing Joker do something as bad as he did to Superman in the Injustice game (Nuke Metropolis, Trick Bats into killing someone he cares about like Alfred), Batman decides to just do the deed and keep joker from ever killing ever again. What happens next? Which other heroes/villains join him? How do the other characters react? Would Batman's plot to end crime worldwide ever last if he tried?

TLDR? Plot of Injustice, but Batman is the bad guy not Superman. What happens.
gpt
He couldn't go bad in the same way Superman did, where he could basically just become a self proclaimed dictator in a week and kind of just wing it. 

Bruce is reliant on subterfuge to get a leg up on his more powerful peers so the best thing he could do is find a way to preemptively kill or contain as many of the leaguers as he could before any of them get a whiff that he's flipped his morality.

Also Batman lacks the level of overwhelming public trust and support across the world Superman has, which would give him a significant disadvantage in forming a power base of ultra powerful lieutenants and civilians around himself like Superman did to convince other heroes that he was in the right, since everyone has been sort of conditioned to give Superman a benefit of a doubt on some level before the floor fell out and found themselves sliding down the slippery slope of  authoritarianism.